Problem: We can calculate ΔH for the reaction: C(s) + H2O(g) → CO(g) + H2 (g) using the following thermochemical equations: C(s) + O2 (g) → CO2 (g)                ΔH1 = −393.5 kJ2 CO(g) + O2 (g) → 2 CO2 (g)      ΔH2 = 566.0 kJ 2 H2 (g) + O2 (g) → 2 H2O (g)      ΔH3 = −483.6 kJ By what coefficient do you need to multiply ΔH2 in determining ΔH for the target equation?a) -1b) 1/2c) -1/2d) 2e) -2

FREE Expert Solution

We're being asked to calculate ΔH for the reaction: 

C(s) + H2O(g) → CO(g) + H2 (g) 

We're given the following thermochemical equations: 

C(s) + O2 (g) → CO2 (g)                ΔH1 = −393.5 kJ

2 CO(g) + O2 (g) → 2 CO2 (g)      ΔH2 = 566.0 kJ 

2 H2 (g) + O2 (g) → 2 H2O (g)      ΔH3 = −483.6 kJ 

View Complete Written Solution
Problem Details

We can calculate ΔH for the reaction: 

C(s) + H2O(g) → CO(g) + H2 (g) 

using the following thermochemical equations: 

C(s) + O2 (g) → CO2 (g)                ΔH1 = −393.5 kJ

2 CO(g) + O2 (g) → 2 CO2 (g)      ΔH2 = 566.0 kJ 

2 H2 (g) + O2 (g) → 2 H2O (g)      ΔH3 = −483.6 kJ 


By what coefficient do you need to multiply ΔH2 in determining ΔH for the target equation?


a) -1

b) 1/2

c) -1/2

d) 2

e) -2

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law. Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems.