49.5 g of water becomes water vapor at its boiling point of 100-C. How many kl of energy is required to evaporate this
amount of water?

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

plz give brainliest

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.