Apply Hess’s Law to determine the ΔH of the overall reaction where we have to get the sum of ΔH of the elementary reactions given
CH3OH (g) → CO (g) + 2H2 (g)
2 C(s) + O2 (g) → 2CO (g) ΔH = -221.0 kJ
2C(s) + O2 (g) + 4 H2 (g) → 2CH3OH (g) ΔH = -402.4 kJ
From the enthalpies of reaction
2 C(s) + O2(g) → 2CO(g) ΔH = -221.0 kJ
2C(s) + O2(g) + 4H2(g) → 2CH3OH(g) ΔH = -402.4 kJ
calculate ΔH for the reaction:
CH3OH(g) → CO(g) + 2H2(g)
a) -90.7 kJ
b) 90.7 kJ
c) -623.4 kJ
d) 180.7 kJ
e) 623.4 kJ
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.
What is the difficulty of this problem?
Our tutors rated the difficulty ofFrom the enthalpies of reaction2 C(s) + O2(g) → 2CO(g) ...as medium difficulty.