I need help with this energy problem.?

Question

Calculate the energy needed to change 10 grams of water from 70 degrees C to 110 degrees C.

I need the energy in Kcal.

Answer 1

Write down the definition equation, and you're halfway home. Inthis case,

Heat = amount x volume change x specific heat.(definition of specific heat)

Specific heat of water = 1 cal g-1 degree-1 (original definition of calory)

So IF it remains as water, there you have it.

BUT I suspect the water is being allowed to boil at 100 C. If so, you need the formula I gave above to heat to 100 C, then the latent heat of evaporation to boil the water, then the specific heat of water vapour to calculate heat required toget from 100 C to110 C.