The pH of a solution obtained when 135mL of 0.616 M NaOH is diluted to 16.0 L with water is 2.28.
How to calculate pH?The pH of a solution is the degree of acidity or alkalinity of a solution.
The pH of a solution can be calculated by using the following equation;
pH = - log {H+}
However, the molarity or concentration of the NaOH solution must first be calculated as follows:
C₁V₁ = C₂V₂
Where;
C₁ = initial concentrationV₁ = initial volumeC₂ = final concentrationV₂ = final volume135 × 0.616 = C × 16000
83.16 = 16000C
C = 0.0052M
pH of NaOH = - log {0.0052}
pH = 2.28
Therefore, the pH of the NaOH solution is 2.28.
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x gm of metal (E=12) was completely dissolved in 100 ml of N/2 HCl. The solution was then made upto 500 ml. 2.5 ml of this diluted acid required 12.5 ml of N/10 NaOH for complete neutralization. Find the valency of x.
When a potent acid, like hydrochloric acid, HCl, is combined with a potent base, such sodium hydroxide, NaOH, the result can be complete neutralization. Strong bases and acids dissociate entirely into their individual ions when they dissolve in water.
An element's valency is its capacity for combination. The periodic table groups have identical elements with the same valency.. How many electrons make up the outer shell of an element determines its valency. The group number.
Valency is simply the amount of electrons that an element's atom gains, loses, or shares to obtain the closest configuration to that of a noble gas. The valency of sodium (Na), magnesium (Mg), chlorine (Cl), and other elements, for instance, is 1.
When there are equal moles of strong acid and strong base, the strong acid and strong base completely neutralize one another. An aqueous solution with a pH of 7 is the end product.
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What color is this? I think it’s blue or gray, but I’m color blind.
Answer:
BLACK
Explanation:
the color is black
Answer: 1st one is black second one is also black
Explanation:
A rubber object that floats in water weighs 9.0 x 10-2 N. What is the weight of the water it displaces?
Weight of water displaces is 9.0 × [tex]10^{-2}[/tex] kg.
By the help of Archimedes’ principle,
F = weight of water displaces
Given, F = 9.0 × [tex]10^{-2}[/tex] N
Hence, weight of water displaces is 9.0 × [tex]10^{-2}[/tex] kg.
Archimedes' principle states that a body immersed in a fluid is subjected to an upwards force same to the load of the displaced fluid. this is a first circumstance of equilibrium. We recall that the above force, referred to as pressure of buoyancy, is located in the center of the submerged hull that we name center of buoyancy.
He did supposedly get an concept as he sat down in a bath, but it wasn't approximately buoyancy that is the phenomenon on which his principle is based. Archimedes' principle states that any object, completely or in part immersed in a fluid, is buoyed up via a force equal to the burden of the fluid displaced through the object.
It is utilized in designing of ships and submarines. It is used in lactometers to determine the purity of milk. it is used in hydrometers to decide density of fluids. It is used in hydraulic lifts.
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Based on the balanced chemical equation shown below, what volume of 0.250 M K2S2O3(aq), is needed to completely react with 37.32 mL of 0.125 M KI3(aq)?
Based on the balanced chemical equation, the volume of 0.250 M K₂S₂O₃ (aq) needed to completely react with 37.32 mL of 0.125 M KI₃ (aq) is 37.32 mL.
What is the balanced equation for the reaction of K₂S₂O₃ (aq) and KI₃ (aq)?The reaction between K₂S₂O₃ (aq) and KI₃ (aq) is a redox reaction.
The balanced chemical equation of the reaction is given as follows:
2 S₂O₃²⁻ (aq) + I₃⁻ (aq) ---> S₄O₆²⁻ (aq) + 3 I⁻ (aq)
Based on the balanced equation of the reaction:
2 moles of K₂S₂O₃ (aq) are required to react with one mole KI₃ (aq).
Moles of KI₃ (aq) in 37.32 mL of 0.125 M solution;
moles = molarity * volumeMoles of KI₃ (aq) = 37.32 * 0.125 M
Moles of KI₃ (aq) = 4.665 mmoles
Moles of K₂S₂O₃ (aq) required = 2 * 4.665 mmoles
Moles of K₂S₂O₃ (aq) required = 9.33 mmoles
Volume of K₂S₂O₃ (aq) required =moles / molarity
The volume of K₂S₂O₃ (aq) required = 9.33 / 0.25
The volume of K₂S₂O₃ (aq) required = 37.32 mL
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look at the picture
Answer: The correct option is ○ O₂
Explanation:
All the other options denote that they are not a single element theyare
in compound form. Only the oxygen is in element form.
Is crude oil and fossil fuel same?
Answer:
yess Petroleum—or crude oil—is a fossil fuel that is found in large quantities beneath the Earth's surface and is often used as a fuel or raw material in the chemical industry.
hey bro how are you??
Calcium carbonate can undergo a chemical reaction to produc calcium oxide (CaO) and carbon dioxide (CO₂). Which possible masses of calcium oxide and carbon dioxide can form when 400g of calcium carbonate undergoes this chemical reaction?
*
1 point
400g CaO and 0g CO₂
224g CaO and 176g CO₂
40g CaO and 10g CO₂
The atomic mass of the element neon (Ne) is 20.180 amu. Which measurement is correct?
1 point
1 gram Ne = 20.180 moles = 1.215×1025 atoms
1 gram Ne = 20.180 moles = 6.022×1023 atoms
1 mole Ne = 20.180 grams = 1.215×1025 atoms
1 mole Ne = 20.180 grams = 6.022×1023 atoms
When reactants of a reaction are known, which fact can always be deduced about the products?
*
1 point
the state of the products
the number of atoms in the products
the number of products
the mass of each product
The atomic mass of carbon (C) is 12.01amu and oxygen (O) is 16.00amu. Which molar mass is correct for carbon dioxide (CO₂)?
*
1 point
28.01 g/mol
44.01 g/mol
192.16 g/mol
268.01 g/mol
How many moles is in 43g of CO₂?
*
1 point
1204 mol
1.54 mol
2.59 x 10²⁵
According to the law of conservation of matter, which statement best describes a balanced chemical equation?
1 point
The number of moles of atoms of each element must be the same in the reactants and in the products.
The total number of moles of atoms must be the same in the reactants and in the products.
The total number of molecules must be the same in the reactants and in the products.
The number of moles of each molecule must be the same in the reactants and in the products.
Nitrogen gas combines with hydrogen gas to produce ammonia (N₂+3H₂⟶Ammonia). Based on the law of conservation of mass, which could be the product of the reaction?
*
1 point
NH₂
NH₃
2NH₃
3NH₂
How do you calculate the number of moles from mass?
*
1 point
it is the product of moles and molar mass
it is the quotient of mass and molar mass
it is the product of mass and molar mass
it is the quotient of avogadro's number and molar mass
Sugar reacts with oxygen gas to produce carbon dioxide and water (C₆H₁₂O₆ + 6O₂⟶6CO₂+6H₂O). Which ratio of components is correct?
*
1 point
For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed.
For each mole of O₂, 1 mole of C₆H₁₂O₆ is needed.
For every 5 moles of water produced, 6 moles of oxygen is needed.
What is the molar mass of NH₄Cl?
*
1 point
53.5 g/mol
50.5 g/mol
497.0 g/mol
Answer:
400CaO and 0g C02
Explanation: 400 has more moiul
This graph shows the titration of 35.0 mL of ethylamine solution with 0.0816 M HCl . Titration of ethylamine with HCl A titration curve shows p H decreasing with volume. The drop in p H is gradual for most of the curve, then p H drops steeply over a smaller volume change, then levels off at a low p H. The steep drop in p H occurs when 20 milliliters to 22 milliliters of H C l have been added. The p H drops from 6.0 to 1.0 over this range. Determine the molarity of the ethylamine solution.
By the definition of molarity, 1000ml of HCl solution contains 0.0858 moles of HCl.
The moles of HCl in 21ml of solutions can be obtained as follows-
Moles of HCl = 21ml *0.0858moles/1000ml
= 0.0081moles
Hence, moles of ethylamine =0.0081moles
Now,
the molarity of ethylamine solutions can be obtained as follows-
Since,
35ml of ethylamine solution contains 0.0018moles
the moles of ethylamine in 1000ml of the solution(molarity) can be obtained as-
Molarity = 1000ml/L * 0.0018mol/35ml
= 0.0514 M
Hence,
the molarity of ethylamine solution is 0.0514 M
This is because, to find molarity of a solution considering a titration curve which is a plot of pH v/s volume of titrant. The equivalence point in the titration curve is the point at which there is a significant change in pH with small addition of titrant. At the equivalence point, the moles of titrant equal the moles of analyte.
The volume of the HCl solution added to reach the equivalence point is 21ml.
At this point, the moles of HCl = moles of ethylamine
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When solving problems using dimensional analysis, the units cancel out diagonally from each other. T or F
The statement that when solving problems using dimensional analysis, the units cancel out diagonally from each other is TRUE.
What is dimensional analysis?Dimensional analysis can be referred to as the analysis of the relationships between different physical quantities by identifying their base quantities and units of measure and tracking these dimensions as calculations or comparisons are performed.
The main idea in Dimensional Analysis is to be able to create a conversion ratio that has the units you want in the numerator and the units you already have in the denominator.
The statement that when solving problems using dimensional analysis, the units cancel out diagonally from each other is TRUE.
Dimensional analysis allows you to convert units by multiplying the old measurement by one (or more) forms of the number 1. While we know that the multiplication by 1 does not change the value of the measurement, it in effect does change the measurement's units.
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How many moles of NO2 form when 10.2 mol NO3 completely reacts.
NO(g)+NO3(g)-->NO2(g)
The number of moles of NO₂ formed when 10.2 moles of NO₃ reacts is 20.4moles.
How to calculate number of moles?According to this question, nitrogen IV oxide (NO₂) reacts with nitrogen II oxide (NO) to form nitrogen VI oxide (NO₃) as follows:
NO₃ + NO → 2NO₂
The number of moles of either the reactants or the products can be calculated stoichiometrically as follows:
Based on the above chemical equation, 1 moles of NO₃ reacts to form 2 moles of NO₂.
This means that if 10.2 moles of NO₃ reacts, 10.2 × 2 = 20.4 moles of NO2 will be produced.
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Isopropyl alcohol is mixed with water to produce a solution that is 70% alcohol by volume. How many mL of each compound is present in 785 mL of this solution?
Answer:
x = 549.5ml
Explanation:
As per the given data,
Volume of alcohol = 70% (v/v) = 70 ml in 100ml solution
Volume of the compound present = 785ml
From the above given values,
x ml solute/785 = 70/100
x ml solute = 70*785/100
x = 549.5ml
therefore, the volume of solute is 549.5ml.
date:09-10-2022
According to the below equation, how many moles of P2H4 will be required to generate 1.76×1023 molecules of P4?
6P2H4→8PH3+P4
The number of the moles of the P₂H₄ is equal to 1.734 moles, which will generate 1.76×10²³ molecules of P₄.
What is the balanced chemical equation?The equation in which the total mass of substances on the reactant side is equal to the total mass of substances on the product side is known as a balanced chemical equation.
The law of conservation of mass must obey by a balanced chemical equation. The given balanced chemical reaction of the reaction of P₂H₄ is :
6 P₂H₄ → 8 PH₃ + P₄
The number of molecules of the phosphorous P₄ formed = 1.76 × 10²³
The number of moles of P₄ = 1.76 × 10²³/(6.022 × 10²³) = 0.292 mol
One of the phosphorous P₄ is formed from P₂H₄ = 6 mol
Then 0.292 mol of P₄ will form from P₂H₄ = 6× 0.292 = 1.734 mol
Therefore, the 1.734 moles of P₄ are required to form 1.76×10²³ molecules of P₂H₄.
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A 56.0 mL sample of a 0.116 M potassium sulfate solution is mixed with 38.5 mL of a 0.102 M lead(II) acetate solution and
the following precipitation reaction occurs
K₂SO₂ (aq) + Pb(C₂H₂O₂)2(aq) 2KC₂H₂O₂(aq) + PbSO₂ (s)
The solid PbSO4 is collected, dried, and found to have a mass of 0.997 g
Determine the limiting reactant, the theoretical yield, and the percent yield
The limiting reactant is lead(II) acetate the theoretical yield is 1.1909 g and the percent yield is 83.71 %.
What is a molarity ?The amount of the sample in a specific solution volume is known as its molarity (M). The molarity of a solute per liter of the a solution is known as molar ratio. The molar concentration in a solution is another name for molarity.
Briefing:Molarity
= moles of solute/volume of the solution
or Moles
= Molarity * volume of solution
For potassium sulfate :
Molarity = 0.116 M
Volume = 56.0 mL
The conversion of mL to L is shown below:
1 mL = 10⁻³ L
Thus, volume = 56.0×10⁻³ L
Thus, moles of potassium sulfate:
Moles = 0.116 M * 56.0 * 10-3 moles
Moles of potassium sulfate = 0.006496 moles
For lead(II) acetate :
Molarity = 0.102 M
Volume = 38.5 mL
The conversion of mL to L is shown below:
1 mL = 10⁻³ L
Thus, volume = 38.5×10⁻³ L
Thus, moles of lead(II) acetate :
Moles = 0.102 * 38.5 *10-3 moles
Moles of lead(II) acetate = 0.003927 moles
According to the given reaction:
[tex]$\mathrm{K}_2 \mathrm{SO}_{4(a q)}+\mathrm{Pb}\left(\mathrm{C}_2 \mathrm{H}_3 \mathrm{O}_2\right)_{2(a q)} \rightarrow 2 \mathrm{KC}_2 \mathrm{H}_3 \mathrm{O}_{2(s)}+\mathrm{PbSO}_{4(a q)}$[/tex]
1 mole of potassium sulfate react with 1 mole of lead(II) acetate
0.006496 moles potassium sulfate react with 0.006496 mole of lead(II) acetate
Moles of lead(II) acetate = 0.003927 moles
Lead(II) acetate is limiting reagent. ( 0.003927 < 0.006496)
0.003927 mole of lead(II) acetate gives 0.003927 mole of lead(II) sulfate
Molar mass of lead(II) sulfate = 303.26 g/mol
Mass of lead(II) sulfate = Moles × Molar mass = 0.003927 × 303.26 g = 1.1909 g
Theoretical yield = 1.1909 g
Given experimental yield = 0.997 g
% yield = (Experimental yield / Theoretical yield) × 100 = (0.997/1.1909 g) × 100 = 83.71 %
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look at the picture
Answer:
I believe it is the last choice
Explanation:
Isotopes of a certain element must have the same atomic number(the # of protons). This is what differentiates the different elements. However, isotopes could have varying amounts of neutrons, therefore the atomic mass could vary as well.
hope this helps :)
please crown me brainliest!!!
a chemist measures the enthalpy change deltaH during the following reaction: COCl2(g)+4NH3(g)--->CO(NH2)2(s)+2NH4Cl(s) deltaH=-559. kJ use this information to complete the table below.
A chemist measures the enthalpy change ∆H during the reaction COCl2(g)+4NH3(g)--->CO(NH2)2(s)+2NH4Cl(s). Then ∆H = -140 KJ.
Enthalpy ChangeThe amount of heat that gets released or absorbed during a reaction and that takes place under constant pressure is referred to as the enthalpy change. The sign for it is H, which can be read as “∆H.”
Note that only reactions carried out under constant pressure are covered by the phrase “enthalpy change.”
What distinguishes entropy change from enthalpy?The main distinction that comes in between enthalpy and entropy, which exists despite the fact that they are both components of a thermodynamic system, is that the enthalpy is expressed as the total amount of heat content whereas altogether the entropy is the level of disorder.
Simply put, what is enthalpy?The whole internal energy is represented by enthalpy. And volume times pressure. The enthalpy of a system cannot be measured, although enthalpy variations can be observed.
Table 1[tex]CoCl_{2}[/tex] + [tex]4NH_{3}[/tex] →[tex]CO(NH_{2} )_{2} + 2 NH_{4}Cl\\[/tex]
∆H = -559 Kj
Then reverse the above reaction and multiply with 2 as sign of ∆H changes from -ve to +ve
[tex]2CO(NH_{2})_{2} + 4NH_{4}Cl[/tex] → [tex]2COCl_{2} + 8NH_{3}[/tex]
∆H = -559 x 2
= 1118 Kj
Table 2[tex]CoCl_{2}[/tex] + [tex]4NH_{3}[/tex] →[tex]CO(NH_{2} )_{2} + 2 NH_{4}Cl\\[/tex]
∆H = -559 Kj
Reverse the above reaction ∆H changes from -ve to +ve
[tex]CO(NH_{2})_{2} + 2NH_{4}Cl[/tex] → [tex]COCl_{2} + 4NH_{3}[/tex]
∆H = +559 Kj
Table 3[tex]CoCl_{2}[/tex] + [tex]4NH_{3}[/tex] → [tex]CO(NH_{2} )_{2} + 2 NH_{4}Cl\\[/tex]
∆H = -559 Kj
Above equation is divided with 4
[tex]\frac{1}{4}[/tex][tex]CoCl_{2}[/tex] + [tex]NH_{3}[/tex] → [tex]\frac{1}{4}[/tex] [tex]CO(NH_{2} )_{2} + \frac{1}{2} NH_{4}Cl\\[/tex]
∆H = -559/4 KJ
= -139.8 KJ
≈ -140 KJ
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PLEASE HELP I DON’T GET THIS :(
Answer:
1.06
Explanation:
One mole of nitrogen is 14.009, or the mass number and you divide 14.9 by 14.009 and get 1.06 for the amount of moles
Answer:
1.063753837 mol
Explanation:
14.9 * (1/14.007) = 1.063753837
Original grams * (1 mol/atomic weight of nitrogen) = 1.063753837
Eris is round an orbits the sun. it is slightly smaller than the planet Mercury. Yet, Eris is classified as a dawrf planet. Why?
Eris is round an orbits the sun, it is slightly smaller than the planet Mercury. Yet, Eris is classified as a dwarf planet because Eris is a plutoid. It is a trans-Neptunian dwarf planet. It is the most distant dwarf planet which is located beyond the orbit of the Neptune.
The orbital characteristics of Eris are more specifically categorized as a scattered disk object. It has been scattered into more-distant and unusual orbits which follows the gravitational interactions with the Neptune as the solar system was forming.
Eris was discovered in 2005 and was classified as the planet. It is a celestial body that orbits the sun, and has enough mass to be round in shape. It has not cleared neighborhood around its orbit as it is a dwarf planet.
Eris is classified as a plutoid because it is farthest from the sun than Neptune. It is massive enough to be pulled into a spherical shape but not as massive as eight planets of solar system.
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If 30.0 grams of sulfur dioxide and 8.4 grams of water combine to form sulfurous acid (H_2_SO_3_), how many grams of sulfurous acid (H_2_SO_3_) must form?
When 30.0 grams of sulfur dioxide and 8.4 grams of water combine then 38.27 grams of sulfurous acid (H₂SO₃) must form.
What is a limiting reagent?A limiting reagent is a reactant that is entirely consumed in the chemical reaction from the reaction mixture and indicates the completion of the reaction and is known as a limiting reactant.
The limiting reagent will decide the maximum quantity of product when reactants will not take in stoichiometric quantities.
Given, the chemical reaction of the formation of sulfurous acid:
SO₂ (g) + H₂O (l) → H₂SO₃ (l)
The molecular mass of the sulfur dioxide, water, and sulfurous acid is 64, 18, and 82g/mol respectively.
Given, the amount of sulfur dioxide, and water is 30 g and 8.4 g respectively.
If 18 grams of water react with sulfur dioxide = 64 g
Then 8.4 g of water reacts with sulfur dioxide = (64/18)×8.4 = 29.86 g
So, water is the limiting reagent in this reaction, which will decide the amount of sulfurous acid.
If 18 grams of water formed sulfurous acid = 82 g
Then 8.4 g of water will form sulfurous acid. = (82/18)×8.4 = 38.27 g
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hexasilicion phosphide chemical formula
Si3P4 this is the answer i beleive!
Please assist with following definitionsSystem and surroundings Specific heat function Entalpy changes Standard enthalpy of formation
System and surroundings:
A system is defined as a matter or region on which analysis is done. The system is separated from the surroundings by the boundary. Everything external to the system is surrounding.
Specific heat function:
The amount of heat that must be added to one unit of mass of the substance in order to cause an increase of one unit in temperature.
Enthalpy changes:
We could say that it is equal to the difference between the energy used to break bonds in a chemical reaction and the energy gained by the formation of new chemical bonds in the reaction.
Standard enthalpy of formation:
It is a measure of the energy released or consumed when one mole of a substance is created under conditions from its pure elements.
Calculate the gram molecular masses of the following species and label those that are compounds: H2O (water), C12H22O11 (table sugar), ---(C3H6)1000--- (polypropylene plastic), S6 (sulfur powder), Al2O3 (aluminum oxide), CHCl3 (chloroform).
The gram molecular masses of the following species are
H₂O is a compound.
molecular mass H₂O :
mass of hydrogen = 1 g/mol
mass of oxygen = 16 g/mol
molecular mass of H₂O = 2 × 1 + 16
= 18 g/mol
C₁₂H₂₂O₁₁ is a compound.
mass of carbon = 12 g/mol
mass of hydrogen = 1 g/mol
mass of oxygen = 16 g/mol
molecular mass of C₁₂H₂₂O₁₁ = 12 × 12 + 22 × 1 + 11 × 16
= 144 + 22 + 176
= 342 g/mol
-----(C₃H₆)₁₀₀----- Polypropylene is a compound.
mass of carbon = 12 g/mol
mass of hydrogen = 1 g/mol
molecular mass of -----(C₃H₆)₁₀₀₀----- = (3 × 12 + 6 × 1 ) × 1000
= 42000 g/mol
Al₂O₃ ( aluminum oxide ) is chemical compound.
mass of aluminum = 27 g/mol
mass of oxygen = 16 g/mol
molecular mass = 2 × 27 + 3 × 16
= 102 g/mol
S₆ (sulfur powder)
mass of sulfur = 32 g/mol
molar mass of = 6 × 32
= 192 g/mol
CHCl₃ ( chloroform) is a compound
mass of carbon = 12 g/mol
mass of hydrogen = 1 g/mol
mass of chlorine = 35 g/mol
molar mass of CHCl₃ = 12 + 1 + 3 × 35
= 119 g/mol
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can you guys help me figure this out? im failing right now
Answer:yes
Explanation: Because i can help u
Draw the Lewis structure of Ch3Br. Include lone pairs of electrons
For a structure of the CH3Br structure, see attached image.
A covalent compound is represented by a lewis structure structure, in which valence electrons, lone pairs, and bonding electrons are represented by dots. Sir G.N. Lewis first described the method in his 1916 article "Atom and Molecule."
They are also known as molecular dot electron diagrams. The CH3Br molecule has fourteen electrons in total. As may be plainly seen in the attached image, each element's atom is surrounded by dots to represent its valence electrons.
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A weather balloon is designed to burst when the volume reaches
250.0 L. The balloon is filled with 32.0 L helium at sea level where the
pressure is 1.00 atm at 20.0 °C. The balloon expands and bursts after
ascending until the temperature is -35.0 °C. Determine the pressure
(in psi) at which the balloon bursts.
The pressure at which balloon bursts is 3.07 psi , when expands and bursts after ascending until the temperature is -35 degree celsius.
What is pressure and it is calculated out to be 3.07 psi?As we have already studied in earlier classes pressure is the force per unit perpendicular area.Here , is given initial volume 32 L and the initial pressure 1 atm , initial temperature 20 degree celsius and final temperature -35 degree celsius. The balloon burst when the volume of gas reaches 250 L, so final volume is 250 L .According to combined gas law : P1V1/T1 = P2V2/T2 , where P1 is the initial pressure , we know that T1 = 20+ 273 K = 293 K.T2 = -35 + 273 = 238 K , now using equation , 1 atm x 32/29 = P2 x 25/238, P2 = 0.209 atm , 1 atm = 14.69 psi , so 0.209 atm = 14.6956 x 0.209 = 3.07 psi.So the balloon bursts at 3.07 psi.To know more about pressure visit:
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How to solve this problem
The 1.662 × 10¹⁸ protons per second will shine on the chemistry text from a 250 W bulb.
What is the photon?A photon or light quantum, is an energy packet of electromagnetic radiation. Einstein suggested the presence of discrete energy packets during the transmission of light and deduced that the light quantum is associated with momentum (hν/c).
A photon is defined as a discrete bundle of electromagnetic energy that also moves at the speed of light (3 × 10⁸ m/s).
The energy of a single photon with a wavelength (λ) of 550 nm can be calculated from the following equation:
E = hc/λ
Where h is Planck's constant has a value equal to 6.626*10⁻³⁴ J·s.
E = (6.626 × 10⁻³⁴ J·s × 3×10⁸ m/s) / (550 ×10⁻⁹m)
E = 3.614 × 10⁻¹⁹ J.
It means that the energy of one photon is equal to 3.614 × 10⁻¹⁹ J.
[tex]1J/s \times \frac{1photon}{3.614 \times 10^{-19} J.}[/tex]
= 2.77 × 10¹⁸ proton/s = 1 Watt
Given, a 200 W bulb converts 5% of its output into light, therefore
200* 5/100 = 6 W
Then 6 watts has photons = [ 2.77 ×10¹⁸ proton/s * 6 ] = 16.62 × 10¹⁸ proton/s
If only 10% of the light will shine on year chemistry textbook, Then
16.62 × 10¹⁸ proton/s × 10/100 = 1.662 × 10¹⁸ protons/s
The number of photons shining on chemistry text = 1.662 × 10¹⁸ protons
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Complete the following acid-base reactions with balanced molecular, total ionic, and net ionic equations: A) Cesium hydroxide(aq)+ nitric acid(aq)
For the acid-base reaction between cesium hydroxide and nitric acid, the given equations are as follows:
Molecular equation: CsOH (aq) + HNO₃ (aq) --> CsNO₃ (aq) + H₂O (l)Total ionic equation : Cs⁺ (aq) OH⁻ (aq) + H⁺ (aq) NO₃⁻ (aq) --> Cs⁺ (aq) NO₃ (aq) + H₂O (l)Net ionic equation : OH⁻ (aq) + H⁺ (aq) --> H₂O (l)What are acid-base reactions?Acid-base reactions are reaction in which acids reacts with bases to form salt and water only.
Acid-base reactions are called neutralization reactions since the acid and base are both neutralized to a neutral substance, salt.
The equations in the acid-base reaction of Cesium hydroxide (aq) and nitric acid (aq) are described below:
The molecular equation shows all the reactants involved in the reaction as molecukemoleculesThe total ionic equation shows all the ions involved in the reactionNet ionic equation: shows only the ions that form a non-ionic product.Learn more about acid-base reactions at: https://brainly.com/question/9836972
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How many moles of NH3 are there in 500cm3 of the gas
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.02moles of NH₃ are there in 500cm³ of the gas.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of any ideal gas =given volume ÷Volume occupied by one mole of a ideal gas at STP
Volume occupied by one mole of a ideal gas at STP=22400cm³
given volume of NH₃=500cm³
substituting all the given values in the above equation we get,
number of moles of NH₃ =500 ÷22400
number of moles of NH₃ =0.02moles
Therefore, 0.02moles of NH₃ are there in 500cm³ of the gas.
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Phillip wants to teach his brother that the Sun gives off heat energy. What can Phillip tell his brother to demonstrate that the Sun has heat energy?
Responses
A It easier to see during the day than at night.It easier to see during the day than at night.
B Ice cream melts faster outside on a sunny day.Ice cream melts faster outside on a sunny day.
C It is warmer inside the house than outside.It is warmer inside the house than outside.
D Sunglasses help keep the light out of your eyes.
using the molar ratio between the limiting reactant (aluminum) and the product copper determine the theoretical yield of copper
Using the molar ratio of the limiting reactant to the product, the theoretical yield of copper would be 192 grams.
What are limiting reactants?In chemical reactions, limiting reactants are reactants that limit the extent of reactions due to their limited quantities as compared to other reactants.
Thus, limiting reactant dictates the amount of product that is formed from reactions.
Considering the reaction:
[tex]3CuCl_2 + 2Al = 2AlCl_3 + 3Cu[/tex]
Aluminum being the limiting reactant has 2 moles. The copper, being the product has 3 moles. Thus, the mole ratio between the limiting reactant and the product is 2:3.
This means that for every 1 mole of aluminum that reacts, 1.5 moles of copper is produced.
3 moles of copper are produced from the reaction.
Recall that: mass = mole x molar mass
Molar weight of copper = 64 g/mol
Mass of 3 moles copper = 3 x 64
= 192 grams
The theoretical yield of copper is, therefore, 192 grams.
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molarity of 74.6 g C₂H6O in 2.36 L of solution
Answer:
0.686 M
Explanation:
To find the molarity of C₂H₆O, you need to (1) convert grams to moles (using the molar mass of C₂H₆O) and then (2) calculate the molarity (using the molarity ratio). The final answer should have 3 sig figs like the given values.
(Step 1)
Atomic Mass (C): 12.011 g/mol
Atomic Mass (H): 1.008 g/mol
Atomic Mass (O): 15.999 g/mol
Molar Mass (C₂H₆O): 2(12.011 g/mol) + 6(1.008 g/mol) + 15.999 g/mol
Molar Mass (C₂H₆O): 46.069 g/mol
74.6 g C₂H₆O 1 mole
------------------------- x -------------------- = 1.62 moles C₂H₆O
46.069 g
(Step 2)
Molarity = moles / volume (L)
Molarity = 1.62 moles C₂H₆O / 2.36 L
Molarity = 0.686 M