Calculate Enthalpy Change For A Chemical Reaction

Question

When CO(g) reacts with O₂(g) according to the following reaction, 283 kJ of energy are evolved for each mole of CO(g) that reacts. Use this information to calculate the enthalpy change for the reaction.

1. 2CO(g) + O₂(g)2CO₂(g)    H_rxn = fill in the blank e45dccf99058fcd_1 kJ

Answer 1

2CO(g) + O2(g) ==> 2CO2(g) ... ∆H = -283 kJ/mole

Since there are 2 moles of CO reacting, the ∆Hrxn = 2 moles x -283 kJ/mole = -566 kJ

The sign of ∆H is negative because the reaction is EXOTHERMIC as evidenced by heat being evolved.