How much energy per gram is absorbed as latent energy when liquid water sublimates?

Question

Quizplus · Accepted Answer

When liquid water sublimates, it goes straight from a solid to a gas. The amount of energy absorbed as latent heat (without a change in temperature) is the sum of the energy required to first break the intermolecular bonds within the solid ice (which requires 80 calories per gram), followed by the energy needed to vaporize the resulting water (which requires 600 calories per gram). Therefore, the total amount of energy absorbed per gram is 680 calories.

How Much Energy Per Gram Is Absorbed as Latent Energy