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Consider a 10 gram sample of a liquid with specific heat 2 J/g*K. By the addition of 400 J, the liquid increases its temperature by 10 K and then boils. Half of the liquid boils away before all the heat is used up. What is the heat of vaporization of the liquid?

A. 10 J/g
B. 20 J/g
C. 80 J/g
D. 200 J/g
E. 40 J/g
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