Answer to Question #279136 in General Chemistry for Vince

Question

Hydrogen gas (H2) reacts with carbon dioxide to produce gaseous water and carbon monoxide.

a. Write a balanced reaction for the reaction.

b. Calculate ΔG

o

for the reaction if Kp is given to be 4.40 measured at 2000K.

c. Calculate for the ΔG of the reaction when the partial pressures are 0.25 atm for H2, 0.78 atm

for carbon dioxide, 0.66 atm for water and 1.20 atm for carbon monoxide.

Answer 1

a)2017

The balanced equation is:

C

O

+

3

2

H

2

→

C

H

2

O

H

Explanation:

The unbalanced equation is:

C

O

+

H

2

→

C

H

2

O

H

Since there is already one mole of carbon (

C

)

 and one mole of oxygen (

O

)

 on each side of the equation, we only need to balance hydrogen (

H

)

. There are 2 moles on the left and 3 on the right. We can multiply the number of moles of H

2

 by 3

2

:

C

O

+

3

2

H

2

→

C

H

2

O

H

This is a correct, balanced chemical equation.

If fractional coefficients make you uncomfortable, though, it would be possible to multiply all coefficients by 2:

2

C

O

+

3

H

2

→

2

C

H

2

O

H

b)Consider this 

thermochemical equation.CO₂(g) + H₂(g) → CO(g) + H₂O(g) ΔH = 42 kJ