Question

2) How many kilojoules of energy is needed to decompose 10.8 grams of N₂Os gas? (SOLO)

2 N₂O5 (g) + 110 kJ—->4 NO2(g) + O2(g)

Answer 1

The energy needed to decompose 10.8 grams of N₂O5 is 110 kJ.

It takes 110 kJ of energy to decompose 2 moles of N₂O5 (the molecular weight of N₂O5 is 108 g/mol). Since 10.8 grams of N₂O5 is equal to 0.1 moles, it takes 110 kJ of energy to decompose 0.1 moles of N₂O5, which is the same as decomposing 10.8 grams of N₂O5.