Question

A 5.0 g ice cube at -20 ⁰C is in a rigid, sealed container from which all the air has been evacuated. How much heat is required to change this ice cube into steam at 200 ⁰C?

Question 3 options:

A) 

1005 kJ

B) 

No option is correct.

C) 

-1005 kJ

D) 

-16 kJ

E) 

16 kJ

Answer 1

The amount of heat is

$$Q=c_\text{ice}m\Delta t_\text{ice}+m\lambda+\\+c_\text{water}m\Delta t_\text{water}+mq+\\+c_\text{steam}m\Delta t_\text{steam}=+16\text{ kJ}.$$