Ethanol has a molar enthalpy of vaporisation of 38.6 kJ/mol at its boiling point of 78 °C…

Ethanol has a molar enthalpy of vaporisation of $38.6\ \text{kJ/mol}$ at its boiling point of $78\ ^\circ\text{C}$. Use $46.069\ \text{g/mol}$. A flask holds $30.0\ \text{g}$ of ethanol at $78\ ^\circ\text{C}$. Find the amount of ethanol and the heat needed to boil it all away. Then compare the heat per mole with the O-H bond energy of $460\ \text{kJ/mol}$ and say what the comparison tells you.