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Enthalpy

A swimmer com...

Question

A swimmer coming out from a pool is covered with a film of water weighing about $18$ g. Calculate the amount of heat required to evaporate this water at $298$ $(Δ_{v a p} H^{o} f o r H_{2} 0 i s 40.66 k J m o l^{- 1})$

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Solution

Moles of $H_{2} O$ (n) $= \frac{18}{18} = 1 m o l e$
Amount of heat required to evaporate this water $= n (Δ_{v a p} H^{\circ}) = 1 \times 40.66 k J = 40.66 k J$

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