what is the heat of vaporization at 25C?

Question

At 25C the heat of fusion of aluminum is 10.6kj/mol adn the heat of sublimation is 326.4kj/mol. what is the heat of vaporization at 25C?
a. 158.2kj/mol
b. 169.5kj/mol
c. 315.8kj/mol
d. 337.0kj/mol
i have the worst teacher!

Answer 1

The answer is c) 315.8 Kj/mol.
Al(s)----> Al(l) heat= 10.6 Kj/mol
Al(l)-----> Al(s) heat =-10.6 =
Al(l)-----> Al(g) heat= 326.8 =
----------------------------------------------------------------Add
Al(l) ------> Al(g) heat= 326.8-10.6
= 315.8 kj/mol heat of vaporization