The standard enthalpy of formation (ΔH˚f) refers to the enthalpy change for the formation of 1 mole of a compound from its elements in their standard states.
If the heat of formation of H2O(l) is -286 kJ/mol, which of the following thermochemical equations for the formation of H2O is correct?
a) H2 (g) + 1 /2 O2 (g) → H2O(l) ΔH = − 286 kJ
b) 2 H(g) + O(g) → H2O(l) ΔH = − 286 kJ
c) H2 (g) + O(g) → H2O(g) ΔH = − 286 kJ
d) H2O(l) → H2 (g) + 1/2 O2 (g) ΔH = 286 kJ
e) 2 H2 (g) + O2 (g) → 2 H2O(l) ΔH = − 286 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 Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.