Question

If the heat of combustion for a specific compound is −1490.0 kJ/mol and its molar mass is 85.69 g/mol, how many grams of this compound must you burn to release 270.00 kJ of heat?

Answer 1

$\Delta H=-1490.0 kJ/mol$

$M=85.69 g/mol$

$Q=270.00kJ$

$m=?$

$m=\frac{M·Q}{-\Delta H}=\frac{85.69·270.00}{1490.00}=15.53g$

Answer: 15.53g