The combustion of coal with oxygen forms CO2 and releases 94. kcal of energy.

C(s) + 02(g) -+ CO2 (g) kcal/mol AH =- 94.

How much energy is released when 6.7 mol of O2 reacts? Be sure your answer has the correct number of significant figures.

kcal of energy released

1 answer

To find the amount of energy released when 6.7 mol of O2 reacts, we need to use the given enthalpy change value:

1 mol of O2 produces -94 kcal of energy
6.7 mol of O2 will produce: -94 kcal/mol x 6.7 mol = -630.8 kcal

Therefore, when 6.7 mol of O2 reacts, 630.8 kcal of energy is released. So, the energy released is -630.8 kcal. The answer is rounded to 4 significant figures.