# 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 ###### 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