Q: At 200 K, Substance X is in the liquid phase. Substance X vaporizes at 400 K and has a heat of vaporization of 49.1 kJ/kg. The heat capacity of Substance X is 640 J/kg*°C. What energy input is required to fully vaporize 1 g of Substance X if its initial temperature is 200 K?
A		49.1 J
B		128 J
C		177.1 J
D		49.23 kJ

Thermochemistry | Quantitative Skills |