Energy Required to Change Water into Steam

[Seinfeld4]

Homework Statement

How much energy is required to change one-quarter of 8.0kg of water at 25 C into steam?

The way I see it, the entirety of the 8.0kg of water must be brought from 25 C to 100 C, then only 2.0kg is changed to steam so...

Specific heat capacity (of water) = 4200 J / kg C
Latent heat of vaporization (of water) = 2.3 * 10^6 J/kg

Q total = (8.0kg) (4200 J / kg C) (100-25) + (2.0kg) (2.3 * 10^6 J/kg)
Q total = 7.12 * 10^6 J

I'm not 100% sure if I'm doing this properly. Does this look correct?

 

[Pi-Bond]

That looks correct to me!

 

[Seinfeld4]

Cool, thanks!