# How much heat is required to convert 200. g of 40 degrees C water to steam at 100' degrees C?

We need (i) the specific heat of water in $J \cdot {K}^{-} 1 \cdot {g}^{-} 1$, and (ii) the enthalpy of vaporization in $J \cdot {g}^{-} 1$ or $J \cdot m o {l}^{-} 1$. We could look these data up, but it is your problem.