Determine the Latent Heat of Vaporization of Unknown Substance X

Multiple Choice

Determine the latent heat of vaporization of unknown substance X in kcal/g if 4.0 g of boiling liquid X are completely vaporized in 1.2 hours by an input of 15 kcal/h into the system by an energy source.

A) 4.5 kcal/g
B) 1.5 kcal/g
C) 2.7 kcal/g
D) 3.0 kcal/g
E) 5.9 kcal/g