Chemistry

Problem

Determine the value of

\Delta H

and

\Delta U

for the reversible isothermal evaporation of 90.0 g of water at

100^\circ\text{C}

. Assume that water vapours behaves as an ideal gas and heat of evaporation of water is

540 \text{ cal g}^{-1}

. (

R = 2 \text{ cal mol}^{-1} \text{ K}^{-1}

)