Explanation:
no of moles = mass / molar mass
mr of Al ( OH)3 = 27+ (16 × 3) + (1 ×3)
= 78
n = 384.3 / 78
n = 4.92692...
n = 4.93
therefore, no of moles = 4.93
The four nitrogen bases are thymine, cytosine, guanine, and adenine. True or false
Answer:
True
Explanation:
A collection of 6. 25×1018 electrons has the charge of.
Answer:
Explanation:
1)The charge of one electron is given by
1 e = - 1.6 * 10-19 C
Then – 1 C = 1 e / ( 1.6 * 10-19 )
= 6.25 * 1018 e
So one-coulomb charge has 6.25 * 1018 electrons
2)Let q1 and q2 be two charges separated by a distance r
Then q1 = - 40 µC = - 40 * 10-6 C
And q2 = 108 µC = 108 * 10-6 C
The collection of 6.25 × 10¹⁸ electrons has a charge of approximately 0.100125 coulombs.
Let's break down the calculation step by step;
Charge of an Electron: The charge of a single electron is approximately 1.602 × 10⁻¹⁹ coulombs. This value represents the fundamental charge carried by an electron.
Number of Electrons: You have a collection of 6.25 × 10¹⁸ electrons. This number tells us how many electrons are present in the collection.
Calculating Total Charge: To find the total charge of the collection of electrons, we need to multiply the number of electrons by the charge of each electron:
Total charge = Number of electrons × Charge of each electron
Total charge = 6.25 × 10¹⁸ electrons x 1.602 × 10⁻¹⁹ C/electron
Calculating the Product: Multiply the numerical values and add the exponents:
Total charge = 1.00125 x 10⁻¹ C.
Final Result: The calculated total charge is approximately 0.100125 coulombs
So, the collection of 6.25 × 10¹⁸ electrons has a charge of approximately 0.100125 coulombs. This means that the combined effect of the individual charges of the electrons in the collection results in an overall charge of 0.100125 coulombs.
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A 5. 0 L vessel has a total pressure of 5. 0 atm. The partial pressure of the gases in the vessel are 1. 2 atm N2 , 2. 0 atm F2 , and 1. 0 atm H2 at 273 K. What is the partial pressure of the remaining gas that was not measured?.
The partial pressure of the mixture is equal to the sum of the individual pressure.The partial pressure of the remaining gas measured will be 0.8 atm.
What is partial pressure?The partial pressure of the mixture is equal to the sum of the individual pressure of the gases present in ther mixture.
The given date in the problemis
Total pressure of the mixture=P
P₁ is the partial pressure of gas 1 (N₂) =1.2 atm
P₂ is the partial pressure of gas 2(F₂)= 2.0 atm
P₃ is the partial pressure of the gas 3(H₂)=1.0 atm
P₄ Is the partial pressure of the gas 4=?
From the defination
P=P₁ +P₂ +P₃+P₄
5=1.2+2.0+1.0+P₄
P₄=0.8 atm
Hence the partial pressure of the remaining gas that was not measured will be 0.8 atm.
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Calculate the number of moles of NaCl contained in 2.6L of a 3.2M solution.
Concentration
mol (n)= M x V
[tex]\tt n=3.2\times 2.6=8.32[/tex]
In an experiment to estimate the enthalpy change of a reaction, a student makes two aqueous solutions, each containing one of the reactants. The student combines the solutions, both originally at the same temperature, in a calorimeter and records the final temperature of the mixture. In addition to the masses of the solutions and the temperature change of the mixture, which of the following pieces of information does the student need to calculate the enthalpy change of the reaction? why?
A) The boiling point of the reaction mixture
B) The heat of fusion of the reaction mixture
C) The density of the reaction mixture
D) The specific heat capacity of the reaction mixture
Based on the formula for calculating quantity of Heat, the student requires the mass, temperature change and the specific heat capacity of the reaction mixture.
What is enthalpy change of a reaction?The enthalpy change of a reaction is the amount of heat evolved or absorbed when reactant molecules react to form products.
In the use of a calorimetry to determine the enthalpy of a reaction, the law of conservation of energy is applied.
Heat lost = Heat gainedThe quantity of Heat is calculated using the formula below:
Quantity of Heat = mass × specific heat capacity × temperature cahangeTherefore, in addition to the masses of the solutions and the temperature change, the student requires the specific heat capacity of the reaction mixture.
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Which of the following statements is true?
plants store excess energy in lipid molecules
sugar and starches are energy-poor
starches form sugar molecules
sugar molecules form starches
PLEASE ANSWER CORRECTLY FOR 10 POINTS
Answer:
it either plant store excess or sugar and starches I'll double check to see which one is correct
A 36-gram sample of water has an initial temperature of 22°c. After the sample absorbs 1200 joules of heat energy, the final temperature of the sample is.
Answer:
≈29.94 [°C].
Explanation:
all the details are in the attachment, the answer is underlined with orange colour.
Hi anyone can help me do these questions,I will mark brainlest,Thank You.
Explanation:
a.
P. When potassium reacts with hydrochloric acid, the salt produced is potassium chloride and sulphur-di-oxide gas is evolved after performing these.
Q.Addition of acid with metal gives salt and hydrogen gas. When dilute Hydrochloric acid is added to iron filings, so chloride & hydrogen gas is produced.
R. and if you talk about gold, gold do not react easily with HCL
b.
# in ascending order P -> Q -> R
c.
# I think its potassium chloride reaction.
hope this helps you
have a great day :)
What volume will 2. 0 moles of nitrogen occupy at 720 torr and 20. 0°C? Formula: PV = nRT (R = 62. 396 L•torr/mol•K) 3. 5 L 6. 6 L 48 L 51 L.
Answer:
the answer is 51 L please brainliest
Explanation:
The volume of 2. 0 moles of nitrogen at 720 torr and 20. 0°C is 51 L
Finding volume of Nitrogen
Using the formulae, PV=nRT
Recall that
1 torr= 0.00132atm
Such that
P=720torr =720 x 0.00132atm= 0.95atm
Also,
V= 20°C= 20+273= 293K
R=0.08206L-atm/mol-K
Solving, we have that
PV=nRT
0.95×V= 2×0.08206×293
V= 2×0.08206×293/ 0.95
V= 50.62L
Rounded to 51 L.
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Budding is an example of what type of reproduction?
A. Internal
B. external
C. ase x ual
D. se x ual
Answered within 5 minutes will get brainliest and follow.
Answer:
C
Explanation:
aseKual reproduction
Budding is a form of aseKual reproduction that results from the outgrowth of a part of a cell or body region leading to a separation from the original organism into two individuals
difference between---
soap and detergent
Answer:
"Soaps are made from natural ingredients, such as plant oils (coconut, vegetable, palm, pine) or acids derived from animal fat. Detergents, on the other hand, are synthetic, man-made derivatives. While soap is limited in its applications, detergents can be formulated to include other ingredients for all sorts of cleaning purposes. Perhaps the most common and versatile of these ingredients are surfactants … surface active agents.
The main difference between soap and detergent is the ingredients. Soaps are made with biodegradable ingredients such as oils, lye and fats. ... Both clean clothes well, but detergents are more effective on stains and with brightening clothes. However, soap is kinder on the environment and skin. "
Hope this helps
Excerpt from textbook
only Q4a, pls help i cant process this question
Explanation:
The group 2 ions are in the second column in the periodic table, for example Be, Mg and Ca
The group 3 ions are in the third column in the periodic table, for example B, Al and Ga
It's the same thing for the rest of the groups
Ions either lose or gain electrons to have a full outer shell, just like the noble gases
metal atoms lose electrons from their outer shell to form positively charged ions
From groups 1 to 3 the charge is the same as the group number
Non metals gain electrons on their outer shell to form negatively charged ions
From groups 5 to 7 the charge is 8 subtract the group number
Example: what is the charge for group 6 ions?
8 - 6 = 2, and the charge is negative so 2-
What are household items that are made up from carbon?
The diagram illustrates a sound wave and a light wave propagating through air.
What would be the BEST question to ask to explain the difference between them?
A
What are the parts of each wave?
B
What is the frequency of each wave?
C
What is the wavelength of each wave?
D
What are the properties of each wave?
which reaction type is the 3rd row?
Answer:
It's a combination reaction
[tex] \underline{ \underline{ \texttt{Combination reaction }}}[/tex]
What is combination reaction?
a reaction in which two reactants combine to form one product.
Why is it combination reation?
As you can see phosphorus and oxygen combined to form Phosphorus trioxide.
what happens to the average kinetic energy of ideal gas molecules when the pressure of the gas is increased by reducing the volume at constant temperature
Answer:
The pressure of the gas is increased by reducing the volume at constant temperature. ... The average velocity of the molecules is increased by a factor of 2.
Explanation:
Use the equation to answer the question.
H2O(l) + heat ⇄ H2O(g)
A sample of water is at equilibrium at 100°C. Which statement best describes what will happen if liquid water is added to the system?
-More liquid water molecules will change to water vapor until a new equilibrium is reached.
-All of the liquid water molecules that are added will become water vapor.
-More water vapor molecules will change to liquid water until a new equilibrium is reached.
-All of the liquid water molecules that are added will remain liquid water.
I need help on this quick check ASAP!
In the system at equilibrium liquid water-water vapor, if liquid water is added to the system, more liquid water molecules will change to water vapor until a new equilibrium is reached.
How can the equilibrium be affected?If a constraint (such as a change in pressure, temperature, or concentration of a reactant) is applied to a system in equilibrium, the equilibrium will shift so as to tend to counteract the effect of the constraint.
Let's consider the following system at equilibrium.
H₂O(l) + heat ⇄ H₂O(g)
Which statement best describes what will happen if liquid water is added to the system?
More liquid water molecules will change to water vapor until a new equilibrium is reached. Yes. This will happen to counteract the excess of liquid water.All of the liquid water molecules that are added will become water vapor. No. Some liquid molecules will change to vapor to attain a new equilibrium.More water vapor molecules will change to liquid water until a new equilibrium is reached. No. The change will happen in the inverse sense.All of the liquid water molecules that are added will remain liquid water. No. Some liquid molecules will change to vapor to attain a new equilibrium.In the system at equilibrium liquid water-water vapor, if liquid water is added to the system, more liquid water molecules will change to water vapor until a new equilibrium is reached.
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Answer:
More liquid water molecules will change to water vapor until a new equilibrium is reached. Yes. This will happen to counteract the excess of liquid water.
All of the liquid water molecules that are added will become water vapor. No. Some liquid molecules will change to vapor to attain a new equilibrium.
More water vapor molecules will change to liquid water until a new equilibrium is reached. No. The change will happen in the inverse sense.
All of the liquid water molecules that are added will remain liquid water. No. Some liquid molecules will change to vapor to attain a new equilibrium.
Explanation:
how many moles are present in 132.7 grams of Cu
Consider the reaction below. H2PO4– H2O Right arrow. H3O HPO42– Which of the following is a base–conjugate acid pair? H2O and H3O H2O and H2PO4– H2PO4– and HPO42– H2PO4– and H3O.
Acid-base conjugate pair forms when the element donates a proton and another species acquires it. [tex]\rm H_{2}O[/tex] and [tex]\rm H_{3}O^{+}[/tex]are the base-conjugate acid pair.
What is base-conjugate acid pair?Acids are the species or element and compounds that donates proton or hydrogen ions to form a conjugate base.
Bases are the elements or compounds that acquires protons or hydrogen ions and form a conjugate acid pair.
Conjugate acids and bases are the species or the products formed when the protons or hydrogen ions are increased or decreased in their chemical structures.
The reaction can be shown as,
[tex]\rm H_{2}PO_{4}^{-} + H_{2}O \leftrightarrows H_{3}O^{+} + HPO_{4}^{2-}[/tex]
From the reaction, it can be said that the water molecule acquired the hydrogen or the proton ions and the hydronium ion produced as a result is the conjugate acid of the water base.
Therefore, [tex]\rm H_{2}O[/tex]and [tex]\rm H_{3}O^{+}[/tex]are the base-conjugate acid pair.
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It's A. H sub2 O and H sub3 O+
Which phrase defines bond energy? (1 point)
energy output when product bonds form
energy required to break a chemical bond
energy stored in chemical bonds
energy input needed to break reactant bonds
The phrase that defines bond energy is the energy required to break a chemical bond.
WHAT IS BOND ENERGY?Bond energy is amount of energy needed to break the atoms involved in a chemical bond into free atoms.
The bond energy of each molecule varies with the type of bond in the molecule. Stronger bonds require a higher bond energy and vice versa.
Therefore, the phrase that defines bond energy is the energy required to break a chemical bond.
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Answer:
D. Energy input needed to break bonds of reactants.
Explanation:
Activation energy is the minimum amount of energy required to initiate a chemical reaction by breaking the bonds of the reactants. It is the energy needed to reach the transition state, where the reaction can proceed, and new chemical bonds can be formed to create the products. The activation energy is the energy barrier that must be overcome for a reaction to occur.
Once the reactants have enough energy to overcome the activation energy, the reaction proceeds spontaneously, and energy is released when new bonds form in the products.
PS. I took the quick check.
gosh i rly need help in the previous questions I asked and no one answered I wish I was smart to answer them alone why am I d.umb
Answer:
gonna check them rn :) youre not d u mb dont worry (:
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
26.7% is the percent composition by mass of sulfur in a compound named magnesium sulfate. Explanation: Molar mass of compound = 120 g/mol.
Help! Hurry! I will mark brainliest if you get it correct. NO SPAM!!!!!!!!
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation how many moles of water can be made when 134 grams of HNO3 are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Answer:
S + HNO3 = H2SO4 + NO2 + H2O
Explanation:
Answer:
Based on stoichiometry HNO3 to H2O is 6:2
Use 9 grams to find the moles of HNO3
9 grams/63g/mol=0.143 moles of HNO3
HNO3:H2O
6:2
0.143*2/6=0.048
H2O moles is 0.048moles
Mass of water =0.048moles*18g/mol=0.864g
To the nearest tenth=0.9grams
Explanation:
I think this is right
Warm air has a natural tendency to sink, independent of any outside force.
true or false
Answer:
false
Explanation:
warm air rises
hope this helps love
Answer:
i think that False would be the correct answer
Explanation:
so so so sorry if this is wrong
Which term is defined as the change from liquid water to water vapor?.
evaporation is the process of liquid water changing to water vapor
Converting 53.3g of oxygen to moles will give you???
0.30 mol O
8.5 mol O
3.33 mol O
5.3 mol O
Answer:
3.33 mol
Explanation:
1 g of oxygen is 0.062502343837894 mol
53.3 * 0.062502343837894
3.3313749265597505 mol
SOMEONE HELP ME PLEASE
SOMEONE HELP ME PLEASE
low kinetic energy
high kinetic energy
Answer:
High kinetic energy.
Explanation:
If an object has a high temperature, that means the atoms of the object have a high kinetic energy. If an object, however, has a low temperature, that means the atoms of the object have a low kinetic energy.
Balance the equation:THANK U IF U FIND IT!!
Answer:
[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]
Explanation:
Here a reaction is given to us and we need to balance the equation . The given reaction is ,
[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]
So here , we can make a table as ,
[tex]\begin{array}{c|c} \\ LHS & RHS \\\\ Zn = 1 & Zn = 1 \\\\ SO_4 = 1 & SO_4 =1\\\\ Li = 2 & Li= 2 \\\\ CO_3 = 1 & CO_3 = 1 \end{array}[/tex]
We can see that the number of elements and ions is same on both LHS and RHS . Hence the reaction is already balanced .
Therefore the final reaction would be same as before that is ,
[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]
I hope this helps .
How many moles are in 96.0 grams of sulfur?
Answer:
There are 2.99 moles or 3 moles of Sulfur in 96 grams
Explanation:
You divide 96 by the atomic weight of Sulfur which is 32.065. For every 32.065 grams of Sulfur you will get 1 mole of Sulfur. The answer should be 2.99 or 3 moles of Sulfur.