Please Help me solve this.
a) What minimum heat is needed to bring 250 g of water at 40
to bring 250 g of water at 40∘ C to the boiling point and completely boil it away? The specific heat of water is C= 4190 J/(kg⋅C)and its heat of vaporization is LV = 22.6×105 J/C
b) How much ice at 0 ∘ C is needed to make rain out of the water vapors of part a and bring it back to the same temperature of 40 ∘ C ?
The heat of meting for ice is Lm = 334 J/kg.
We consider the system is completely isolated from the environment.
Show your complete solution.
Q = mC ( T2 - T1)
Q = m LV
Q = m Lm