Answer to Question #320076 in General Chemistry for Enthalpy

Question

A scientist measures the standard enthalpy change for the following reaction to be -558.9 kJ :

H₂CO(g) + O₂(g)CO₂(g) + H₂O(l)

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H₂CO(g) is 

Answer 1

The answer to your question is provided in the image: