Question

how many kilojoules of heat is released when 89g of heptanol is burned

Answer 1

The molar heat of combustion of 1-heptanol is approximately -4640 kJ/mol (can be found on several open sources).

The molar mass of heptanol (C₇H₁₅OH) is 116.88 g/mol.

Therefore,

$\Delta{H_c}=89\ g\times\frac{-4640\ kJ}{116.88\ g}=-3.5\times10^3\ kJ$, which means that $3.5\times10^3\ kJ$ is released.

Answer: $3.5\times10^3\ kJ$