Mass of H2CO3 = 1.05g
Givens: NaHCO3 = 3.24
Na2CO3 = 2.19
Mass of H2CO3 = mass of NaHCO3 - mass of Na2CO3
Mass of H2CO3 = 3.24g - 2.19g
Mass of H2CO3 = 1.05g
How do you find the mass number?The number of protons and the number of neutrons combine to determine the mass number of an element. Mass number = proton + neutron. If you want to calculate the number of neutrons an atom has, you can simply subtract the number of protons or atomic numbers from the mass number.
Divide the mass of a substance in grams by the molecular weight. This will give you the number of moles of the substance in a particular mass. For 12 g of water, (25 g) / (18.015 g / mol) = 0.666 mol.
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Example of solvent extraction
Answer:
Liquid–liquid extraction
Explanation:
A system is a group of parts that can be considered one unit. Storm systems, ecosystems, and our bodies are natural systems. Cars and houses are human-made systems. Choose an example of a system, and analyze the energy flow through the system. Describe in detail how energy enters the system, how energy changes form while in the system, and how energy leaves the system.
An ecosystem is simply a collection of communities of plants, animals, and microbes interacting together and with their physical environments.
Energy flow in an ecosystemEnergy enters the ecosystem through a group of living organisms known as the producers. the producers are mainly the green plants that are capable of photosynthesizing.
Photosynthesis converts solar radiation from the sun to chemical energy in green plants. Another group of organisms in the ecosystem, the primary consumers, feed directly on the producers and as such, are able to gain some energy from them.
The secondary consumers obtain their own energy by feeding on primary consumers. Tertiary consumers feed on the secondary consumers for their own energy and the food chain goes on and on.
Only about 10% of the available energy in one trophic level goes to the next trophic level. The rest of the energy is lost as heat to the surroundings. Thus, the producers have the highest energy in the ecosystem while organisms at the top of the food chain have the lowest energy.
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How many grams of LiOH are needed to make 25 mL of a 0.125 M solution?
Please explain because I have no idea how to solve this
Answer:
0.0734 grams LiOH
Explanation:
The molarity formula looks like this:
Molarity (M) = moles / volume (L)
You are given the molarity and volume (in mL). Therefore, you can plug these values into the equation and solve for moles (after you convert from mL to L).
25 mL / 1,000 = 0.025 L
0.125 M = moles / 0.025 L
(0.125 M) x (0.025 L) = moles
0.003125 = moles
After using the molarity formula, we know that 0.003125 moles LiOH are needed to satisfy these conditions. Now, we can convert this to grams using the molar mass of LiOH. This can be determined using the values from the periodic table. Remember to write your conversion in a way that allows for the units to cancel out.
Molar Mass (LiOH) = 6.941 g/mol + 16.00 g/mol + 1.008 g/mol
Molar Mass (LiOH) = 23.499 g/mol
0.003125 moles 23.499 g
------------------------ x ------------------- = 0.0734 grams LiOH
1 mole
0.074 grams of lithium hydroxide are needed to make 25 ml of 0.125 M solution, according to the concept of molar concentration.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Here , in the problem mass is to be determined, hence the formula used is the first one mentioned.
Substituting values in the formula,mass=molar concentration×molar mass×volume in liters
∴0.125×23.95×0.025=0.074 g.
Hence, 0.074 g of lithium hydroxide are required to prepare 25 ml of 0.125 M solution.
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Please help!!
Is this an:
Acid
Base
Neither
Answer:
it is a weak acid
acid
Explanation:
formaldehyde is a weak acid (pK greater than 13),
The density of methane at 0 degree Celsius and 1 atm pressure is 0.668g/L. If 1 lb is equal to 454 grams, 1 L is equal to 1000cm3 and 1 inch is equal to 2.54 cm, what is the density in pounds per cubic inch
The value of density in the required units is [tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex]
What is Density ?Density, mass of a unit volume of a material substance. The formula for density is
d = M/V
where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimetre.
In the given question
Density given is 0.668 g/L
1 lb = 454grams.
1L = 1000 cm³
1 inch = 2.54 cm
Density in pounds per cubic inch =
[tex]\rm \rho = 0.668 \times \dfrac{(1 \;lb)(1 grams)}{454\; grams}\times \dfrac{(1 L)(2.54)^{3}(1 cm^{3})}{1000cm^{3}(1\;L)(1 in^{3})}[/tex]
[tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex]
Therefore the value of density in the required units is [tex]\rm \rho = 2.4\times 10^{-5} lb/in^{3}[/tex].
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What is the molarity of .200 L of solution in which 2.0 moles of sodium bromide is dissolved?
Answer:
it’s 10ml
Explanation:
200/2 = 10
please assist with answering the attached assignment
For first order plot of ln( [tex]P_{SO_{2}Cl_{2}}[/tex]) vs time will be a straight line, which shows first order reaction
What is First Order Reaction ?
A first-order reaction can be defined as a chemical reaction in which the reaction rate is linearly dependent on the concentration of only one reactant. In other words, a first-order reaction is a chemical reaction in which the rate varies based on the changes in the concentration of only one of the reactants
Every mole of SO₂Cl₂ that dissociates results in a mole of SO₂ &Cl₂
[tex]\rm P_{total}= P_{Cl_{2}\\}+ P_{SO_{2}Cl_{2}}+ P_{SO_{2}}\\\\ P_{total} = P_{o}- \beta +\beta + \beta\\\\ P_{total} = P_{o}+\beta[/tex]
For first order plot of ln( [tex]P_{SO_{2}Cl_{2}}[/tex]) vs time will be a straight line.
t(hr) [tex]P_{SO_{2}Cl_{2}}[/tex] ln([tex]P_{SO_{2}Cl_{2}}[/tex] )
0 11.07 2.404
3 7.35 1.995
6 4.88 1.585
9 3.24 1.176
12 2.15 0.765
15 1.43 0.358
β = P(total) - P(initial)
[tex]\rm P_{SO_{2}Cl_{2}}[/tex] = P₀ - β
for t= 3
β =3.72
and
[tex]\rm P_{SO_{2}Cl_{2}}[/tex] = 7.35
For first order plot of ln( [tex]P_{SO_{2}Cl_{2}}[/tex]) vs time will be a straight line, which shows first order reaction.
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MgCl2(aq) + NaOH(aq) →
Explanation:
MgCl2(aq) + NaOH(aq) = Mg(OH)2(s) + NaCl. Both magnesium nitrate and sodium hydroxide solutions are colourless solutions. When they react with each other, a white precipitate (Mg(OH)2) and a colourless solution is given. Sodium chloride exists in the colourless aqueous solution.
What is the percent composition of Cesium and Fluorine in CsF?
The percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
What is a percentage composition?Percent composition is very simple. Percent composition tells you by mass what percent of each element is present in a compound.
Molecular mass of Cs = 132.9054519
Molecular mass of F = 18.9984032
Molecular mass of CsF = 132.9054519 + 18.9984032 = 151.9038551
CsF: Percent composition by element:
Cesium (Cs) = [tex]\frac{32.9054519 X 100}{151.9038551}[/tex] = 87.493 %
Fluorine (F) = [tex]\frac{18.9984032 X 100 }{151.9038551}[/tex]= 12.507 %
Hence, the percent composition of Cesium and Fluorine in CsF are 87.493 % and 12.507 % respectively.
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How many pounds of manganese are in 1.261 tons of Mn2O3?
Answer:
2000pound
Explanation:
Manganese metal is produced from the manganese(III) oxide, Mn2O3, which is found in manganite, a manganese ore. The manganese is reduced from its +3 oxidation state in Mn2O3 to the zero oxidation state of the uncharged metal by reacting the Mn2O3 with a reducing agent such as aluminum or carbon. How many pounds of manganese are in 1.261 tons of Mn2O3? (1 ton = 2000 pounds)
About 40 different substances called organophosphorus compounds are registered in the United States as insecticides. They are considered less damaging to the environment than some other insecticides because they breakdown relatively rapidly in the environment. The first of these organophosphorus insecticides to be produced was tetraethyl pyrophosphate, TEPP, which is 33.11% carbon, 6.95% hydrogen, 38.59% oxygen, and 21.35% phosphorus. It has a molecular mass of 290.190.
A quantity can be converted from one unit of measurement to another while maintaining its value. There are 2522 pounds of manganese in 1.261 tons of [tex]\rm Mn_2O_3[/tex].
It is a fundamental idea that is applied in many different disciplines such as science, engineering, math and daily life. To complete a conversion, it is necessary to know the conversion factor – the numerical relationship between the two units of measurement. With the help of this factor, you are able to convert units while keeping the value constant.
To convert tons to pounds we need to know that 1 ton is equal to 2000 pounds.
Given that you have 1.261 tons of [tex]\rm Mn_2O_3[/tex], we can calculate the number of pounds as follows:
Number of pounds = 1.261 tons * 2000 pounds/ton
Number of pounds = 2522 pounds
Therefore, there are 2522 pounds of manganese in 1.261 tons of [tex]\rm Mn_2O_3[/tex].
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3. Determine the amount of energy required to heat 3.50 moles of water vapor from 107°C to 13
4. How much energy is needed to heat a 27.50 grams of H₂O (s) at -20°C to H₂O (l) at 0°C?
Answer: See attached image
Explanation:
how to solve this? what is the calculation of 100ml of 0.1 N H2SO4 by diluting from original H2SO4.
Atomic mass of: O=16 , H=1 S=32
d H2SO4=1.08 purity%=98
I need the solution and I will give a 5 star and brainliest
The answer is 0.46 ml of the original H₂S0₄ and dilute to a final volume of 100 ml.
What is Normality ?Normality is a measure of concentration equal to the gram equivalent weight per liter of solution.
Normality = Number of gram equivalents × [volume of solution in litres]⁻¹
Preparing 100. ml of 0.1 N H₂S0₄
Eq. wt. of H₂S0₄ = 98/2=49
density of H₂S0₄= 1.08
Purity =98%
1 N H₂S0₄ = 49 gH₂S0₄ / liter
1 gm equiv wt /L x 1 gm equiv. wt / 2 = 98 / 2 = 49 g)
0.1 N H2SO4 = 4.9 g / L
To make 100 ml (0.100 L) we would need 4.9 [tex]\rm \frac{g}{L}[/tex] x 0.1 L
= 0.49 g H₂S0₄/100ml
Original density = 1.08 g / ml
with a purity of 98%,
this converts to 1.08 g x 0.98 = 1.058 g /ml
0.49 g H₂S0₄ x 1 ml / 1.058 g = 0.46 ml of original H₂S0₄needed
Therefore to make the desired solution
Take 0.46 ml of the original H₂S0₄ and dilute to a final volume of 100 ml.
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calculate the mass of copper that could be made from 4.0g of copper oxide
The mass of copper that will be produced from copper oxide is determined as 3.19 g.
Mass of copper produced from copper oxide
The mass of copper that will be produced from copper oxide is calculated as follows;
2Cu + O₂ -----> 2CuO
2 1 2
2(63.5) ------------ 2(79.5)
x ---------------------- 4 g
x = (4 x 2 x 63.5)/(2 x 79.5)
x = 3.19 g
Thus, the mass of copper that will be produced from copper oxide is determined as 3.19 g.
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Charle's Law
At 225 °C a gas has a
volume of 400 mL. What is
the volume of this gas at 127
°C?
Given:
Unknown:
Formula:
Solution:
Final answer:
Convert temperature to Kelvin
225°C=498K127°C=400KConvert vol to L
400mL=0.4LApply Charles law
V1T_2=V2T_10.4(400)=498V_2160=498V_2V_2=0.32L=320mLAnswer:
Given:[tex]V_{1} = \text{400.0 mL}[/tex]
[tex]T_{1} = 225.0^{\circ}\text{C + 273.15 = 498.15 K}[/tex]
[tex]T_{2} = 127.0^{\circ}\text{C + 273.15 = 400.15 K}[/tex]
Unknown:[tex]V_{2}[/tex]
Solution:[tex]\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}[/tex]
[tex]V_{2} = V_{1} \times \dfrac{T_{2}}{T_{1}}[/tex]
[tex]V_{2} = \text{400.0 mL} \times \dfrac{\text{400.15 K}}{\text{498.15 K}}[/tex]
[tex]\boxed{V_{2} = \text{321.3 mL}}[/tex]
Therefore, the volume of the gas at 127.0°C is 321.3 mL
[tex]\begin{gathered}\\\end{gathered}[/tex]
Students conducting a lab investigation are given two unknown tubes of colorless aqueous solutions. The students are told that one tube is a salt solution and the other is a sucrose solution. How can the students determine which of the solutions contains salt?
The students can determine which of the solutions contains salt through the conductive tester.
What is an ionic solution?It is a solution containing ions are atoms that have gained or lost electrons to acquire a positive (lost electron) or negative (gained electron) charge.
An ionic solution would be able to conduct electricity whereas the covalent would not so if you have a conductivity tester which is available in most labs.
The students can distinguish between the 2 solutions through the conductive tester.
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Which of the following describes how air resistance affects the motion of a falling object?(1 point) Air resistance may change the direction of a falling object but does not affect its speed. Air resistance may change the direction of a falling object but does not affect its speed. Air resistance opposes the force of gravity and causes falling objects to lose speed once they reach terminal velocity. Air resistance opposes the force of gravity and causes falling objects to lose speed once they reach terminal velocity. Air resistance opposes the force of gravity and causes an object to reach terminal velocity. Air resistance opposes the force of gravity and causes an object to reach terminal velocity. Air resistance works with gravity to pull a falling object towards the Earth. Air resistance works with gravity to pull a falling object towards the Earth.
Answer:
Air resistance opposes the gravity in a falling object hence the object loses speed once it reaches terminal velocity.
According to the experim
Find the formula for the hydrate
0.737 g MgSO3 and 0.763 g H2O
The required formula of hydrate is MgSO₃.6H₂O.
How do we calculate the formula of hydrate?The number of moles of water per mole of anhydrous solid (x) will be computed by dividing the number of moles of water by the number of moles of anhydrous solid (x) to find the hydrate's formula.
Moles will be calculated as:
n = W/M, where
Moles of MgSO₃ = 0.737g / 104.3g/mol = 0.007mol
Moles of H₂O = 0.763g / 18g/mol = 0.04 mol
Number of H₂O molecule = 0.04/0.007 = 5.7 = 6
So formula of hydrate is MgSO₃.6H₂O.
Hence required formula of hydrate compound is MgSO₃.6H₂O.
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Use the equation to answer the following question.
2H₂ + O₂ → 2H₂O
How many grams of H₂O are produced from 64.0 g of O₂?
O A. 72.1 g
Answer:
rsghkm vumm
Explanation:
el correo de confirmación con la que se ha enviado desde correo ok recibido gracias saludos María del Ca
Will the following compounds create solutions? Explain your answers.
Solvent Solution? Y/N Explain
Solute
Nal
H₂O
KBr
CH₂
CO₂
CF₁
LICI
CCI
NH₂
H₂O
CO₂
H₂O
The following compounds create solutions that are listed below
What is a solution ?A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.
solvent: the substance in which a solute dissolves to produce a homogeneous mixture
solute: the substance that dissolves in a solvent to produce a homogeneous mixture
1. Nal and H₂O
It will form an ionic solution .
2. KBr and CH4
It will not form a solution
3. CO₂ and CF₄
It will not form a solution
4. LiCI and CCl₄
It will not form a solution
5. NH₃ and H₂O
It will also form a solution and liberate ions of ammonium
6.CO₂ and H₂O
It will form a solution named as carbonic acid
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what is the effect of temperature and pressure on crystal structure ?
ty! :)
Answer:
Increase of pressure increases the coordination number during crystallization e.g. by applying pressure the NaCl type crystal structure having 6:6 coordination number changes to CsCl type crystal having coordination number 8:8.
welc!! you Σ=)
What is the nuclear composition of uranium-235?
92 electrons + 143 protons
92 protons + 143 electrons
O 143 protons + 92 neutrons
O 92 protons + 143 neutrons
♡
Answer:
The nuclear composition of uranium-235 is 92 protons and 143 neutrons.
Chloroquine is used to treat malaria. Studies have shown that one dose for a 12 kg child is 3.5 mg/kg of body weight and that 4 doses should be taken per day. How many milligrams of this drug should be given in one day?
Round your answer to the correct number of sig figs.
Answer: 100 milligrams per dose
10 mg per kg. The drug of ten kilos so you do
10 mg * 10 kg = 100 mg per dose
Explanation:
[Co(H2O)6]2+ what is the name
C. Uprooted plants dry and die. Why?
Because:
Their roots are no longer in the soil. Thus, can't absorb water and mineral ions needed for plant growth via photosynthesis.
Hope this helps!
Answer:
Yes
Explanation:
Well this is because when a plant is planted water goes from the soil, into the roots then finally distributed to other parts of the plant.
So when plants have been plucked or uprooted water no longer has access to the plant which may result to the plant being dried up and will possibly die
formular for calculating weight
The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
W = mg
Weight of object = mass of object × acceleration of gravity
7. How many molecules are in 4.80 moles of NaCL?
Answer:
280gr of salt
Explanation:
4.80 x ( 22.99 + 35.45) = 280gr
Simple as that
a sample of sulfur dioxide occupies a volume of 652 mL at 40.0 C and 0.75 atm. What volume will the sulfur dioxide occupy at STP?
The volume that sulfur dioxide will occupy with a volume of 652 mL at 40.0°C and 0.75 atm is 0.019moles. Details about volume can be found below.
How to calculate volume?The volume of a gas can be calculated using the following formula:
PV = nRT
P = pressureV = volumen = number of molesR = gas law constantT = temperature0.75 × 0.652 = n × 0.0821 × 313
0.489 = 25.69n
n = 0.489/25.69
n = 0.019moles
Therefore, the volume that sulfur dioxide will occupy with a volume of 652 mL at 40.0°C and 0.75 atm is 0.019moles.
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Atmospheric pressure on the peak of Kilimanjaro can be as low as 0.20 atm. If the volume of an oxygen tank is 10.0L, at what pressure must the tank be filled so the gas inside would occupy a volume of 1.2 x 1043 L at this pressure?
Answer:
24 atm
Explanation:
From Boyle's Law :
P₁V₁ = P₂V₂Given values :
P₂ = 0.2 atmV₁ = 10.0 LV₂ = 1.2 x 10³ LSolving
P₁ × 10 = 0.2 × 1.2 × 10³P₁ = 0.24 x 10²P₁ = 24 atmNew volume
1.2×10⁴³So apply Boyles law
P1V1=P2V20.2(10)=P2(1.2×10⁴³)20=P2(1.2×10⁴³)P2=1.2×10⁴³/20P2=0.6×10⁴²P2=6×10⁴¹atmHow many grams of chlorine atoms are present in a 3.45 g sample of barium chloride (BaCl2)?
Grams are the unit of measurement of the mass or the weight of the substance. There are 1.17 gms of chlorine atoms in the sample.
What is mass?The mass of the substance is the multiplication of the moles and the molar mass.
Barium chloride dissociates as:
BaCl₂ ⇄ Ba²⁺ + 2 Cl⁻
From the reaction, it can be said that 1 mole of barium chloride dissociates into 1-mole barium ion and 2 moles of chloride ions.
Moles of barium chloride are calculated as:
Moles = mass ÷ molar mass
= 3.45 gm ÷ 208.23 g/mol
= 0.016 moles
If 1 mole of Barium chloride has 2 moles then 0.016 moles of the sample will have, 0.0331 moles of chloride ions.
The mass of chlorine atoms is calculated as:
Mass = moles × molar mass
= 0.0331 × 35.45
= 1.17 gms
Therefore, 1.17 gms of chlorine atoms are present in barium chloride.
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On the basis of its name, what is the correct structural formula for pentene? CH2=CH−CH2−CH3 CH3−CH2−CH2−CH3 CH3−CH2−CH2−CH=CH2 CH3−CH2−CH2−CH2−CH3
The answer is CH₃-CH₂-CH₂-CH=CH₂ , Option C correctly represents the structural formula for pentene .
What is Alkene ?Any hydrocarbon containing one or more double bonds.
Alkenes are generally colorless non-polar compounds, somewhat similar to alkanes but more reactive.
The first few members of the series are gases or liquids at room temperature.
Pentenes are alkenes with the chemical formula C₅H₁₀.
Each contains one double bond within its molecular structure.
CH₃-CH₂-CH₂-CH=CH₂ , Option C correctly represents the structural formula for pentene .
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