How much heat will be given off?

Question

2C3H6O (I) + 8O2 (g) = 6CO2 (g) + 6H2O( g) + 853.6 KCAL

Write the amount of heat that will be given off, if 0.350 mol of acetone is burned completely?

Heat = ........kcal

please write down the steps.

thank you

Answer 1

The reaction, as written, indicates that 853.6 kcal of heat is given off for every 2 moles of C₃H₆O is combusted. So...

853.6 kcal / 2mol x 0.350 mol = 149 kcal

Or looking at it in steps:

853.6 kcal / 2mol acetone = 426.8 kcal / mole acetone

426.8 kcal / mole acetone x 0.350 moles acetone = 149 kcal