Energy needed to evaporate all Earth's oceans

[Numeriprimi]

Homework Statement

Philosophizing in physics lessons ... How much energy is needed to evaporate all the oceans on Earth?

Homework Equations

So, I think: E=Q=mL
And variables i found...

I don't care specific calculation, I interested in method... It is good?

Sorry for my bad English and thanks!

 

[haruspex]

Don't forget you need to raise the temperature to boiling as well. What's the average temperature of the oceans?

 

[Numeriprimi]

Ouu, yes...
So, first: Q=mc(t_1-t_2) an then Q=mL?
The average temperature of the ocean surface waters is about 17 degrees Celsius (62.6 degrees Fahrenheit). BY: http://www.windows2universe.org/earth/Water/temp.html

 

[haruspex]

But that's surface temperature. Try http://hypertextbook.com/facts/2007/LilyLi.shtml