A car’s gas tank contains 58.7 kg of gasoline, which takes up 0.0814 m^3 of volume. what is the density of the gasoline? unit = kg/m^3

The amount of heat required to change liquid water to vapor at its boiling temperature is 2256 kj/kg. the amount of heat required to change liquid mercury to its vapor state at its boiling temperature is 295 kj/kg. one kg of each substance is currently at its boiling point. how will the amount of thermal energy required to change each substance from a liquid to a gas differ?