What is the total energy needed to boil 255 grams of water, given that the
δh vaporization= 40,650 j/mol

Explanation:

1) Convert the mass of water into number of moles

        n = 255 g / 18.015 g/mol = 14.15 mol

2) Use the formula E = n × ΔH vap

This is, you have to multiply the molar ΔH vaporization by the number of moles to find the total energy to boil the given amount of water.

3) Round to the correct number of significant figures.

The mass of water is the measurement with the least number of significant figures (3), so you must report the answer with 3 significant figures,

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