The heating curve for a sample of pure water is provided. The temperature was recorded as a 50g sample of solid water was heated at a constant rate. Which of the following explains why the slope of the segment of steam is greater than the slope of the segment of liquid water?
1) The specific heat capacity of steam is greater than that of liquid water.
2) The latent heat of vaporization of steam is greater than the latent heat of fusion of liquid water.
3) The density of steam is greater than the density of liquid water.
4) The temperature of steam is greater than the temperature of liquid water.