When 1 mole of h2co(g) reacts with o2(g) to form co2(g) and h2o(l) according to the following equation, 563 kj of energy are evolved. h2co(g) + o2(g)co2(g) + h2o(l) is this reaction endothermic or exothermic? what is the value of q? write a balanced thermochemical equation

This is an exothermic reaction

q = 563 kJ

Explanation:

Step 1: The balanced thermochemical equation

H2CO(g) + O2(g) → CO2(g) + H2O(l)        ΔH = -563 kJ

This is a combustion, this means there will be released heat. This means it's an exothermic reaction.

The energy involved, will be released (that's why ΔH is negative)

q has the same value as ΔH (but positive)

q = 563 kJ

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- melanie

it's c. elements are placed in rows based on how may valencies electrons have.