Project #33678 - Chemistry

5 chemistry questions.

1. Carbon can react with oxygen to form CO2 according to the following reaction:

 

 

 

 

C(s) + O2(g) → CO2(g),     Kc = 2.25 x 102

 

 

 

If a reaction vessel containing excess carbon is filled with O2(g) at a concentration of 1.96 mol L-1, what is the concentration of CO2(g) after equilibrium is established? Complete the table below to help you.

 

Concentration

O2

CO2

Initial

1.960

0.0000

Change

 

 

Equilibrium

 

 

 

 

 

   a) 2.29 mol L-1

 

   b) 3.12 mol L-1

 

   c) 1.95 mol L-1

   d) 0.604 mol L-1

 

2. 6. If the reaction given in question 5 has an enthalpy change of +125 kJ, will more CO2 or less CO2 be formed if the reaction is carried out at higher temperatures?

 

 

 

 

    a) more

    b) less

 

3. 7. NO2 reacts with F2 to give NO2 according to the following overall reaction:

 

 

 

 

 

 

2NO2(g) + F2(g) → 2NO2F(g)

 

 

 

What is the equilibrium constant for this reaction given:

 

 

 

NO2(g) + F2(g) → NO2F(g) + F(g),    K = 1.3 x 102

 

 

 

NO2F(g) → NO2(g) + F(g),    K = 2.7 x 10-2

 

 

 

    a) 9.6 x 104

 

    b) 7.2 x 105

 

    c) 5.6 x 10-3

 

    d) 4.8 x 103

 

4. 12. The pH for a 2.6 mol/L propanoic acid solution was 2.24. What is the Ka of propanoic acid, given that propanoic acid is a monoprotic weak acid and does not dissociate readily?

 

 

 

 

    a) 4.5 x 10-7

 

    b) 1.3 x 10-5

 

    c) 7.8 x 10-4

 

    d) 1.4 x 10-2

 

5. 14. The Ksp for magnesium fluoride is 3.7 x 10-8. The equilibrium is: MgF2(s) ⇌ Mg2+ + 2F-. Calculate the solubility of magnesium fluoride in mol/L.

 

 

 

 

    a) 4.7 x 10-5 mol/L

 

    b) 2.1 x 10-3 mol/L

 

    c) 5.2 x 10-6 mol/L

    d) 1.1 x 10-4 mol/L

 

 

 

 

 

 

Subject Science
Due By (Pacific Time) 06/21/2014 12:00 am
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