General Chemistry Answers

Suppose that 0.250mol

m

o

l

 of methane, CH

4

(g)

C

H

4

(

g

)

, is reacted with 0.400 mol

m

o

l

 of fluorine, F

2

(g)

F

2

(

g

)

, forming CF

4

(g)

C

F

4

(

g

)

 and HF(g)

H

F

(

g

)

 as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released?

On complete combustion, 0.246 g of an organic compound gave 0.198 g of CO2 and 0.1014 g of H2O. What is the ratio of carbon and hydrogen atoms in the compound?

Q about multiple dilutions - I have 9L of old motor oil; I replace 7L with new oil and mix. Then I replace 4.5L with new oil again. What is the final dilution of old oil remaining in the final 9L?

What is the rate of reaction when [N2O5]=0.0250[N2O5]=0.0250 ?

Express the rate in molarity per second to three significant figures.

The rate constant for a certain reaction is k= 8.60×10⁻³s^−1. If the initial reactant concentration was 0.600 M, what will the concentration be after 17.0 minutes?

You mix 50.0 mL of 0.165 M AgNO₃ with 25.0 mL of 0.302 M Ca(NO₃)₂. What is the concentration (M) of the NO₃^- anion in this solution mixture?

A 4.626 g sample of a hydrocarbon, upon combustion in a combustion analysis apparatus, yielded 6.484 g of carbon dioxide. Calculate the mass percent of carbon in the hydrocarbon.

Give specific examples of solutions in each of the following states:

(a) gas in gas, (b) gas in liquid, (c) liquid in liquid, (d)solid in liquid, (e)

solid in solid. For each example, identify the solute and solvent

A solution of table sugar in water contains 5.25% by mass sucrose. Calculate:

1) the mass of sucrose in 225 g of solution

2) the amount of solution needed to obtain 70.0 g of sucrose

3)the mass of water contained in 450 g of the solution

4)the mole fraction of sucrose and water in 5.25% by mass sucrose.

How many grams of dilute is present in 0.4 moles magnesium hydroxie, Mg (OH)2 in 559 g water, H2O? molar mass of Mg (OH)2 is 58 g / mol