Question: A glass filled with water has radius (3 mathrm{~cm}); left open, in (4 mathrm{~h}) the level has dropped (1 mathrm{~mm}). Determine, in grams/hour, the rate

A glass filled with water has radius $3 \mathrm{~cm}$; left open, in $4 \mathrm{~h}$ the level has dropped $1 \mathrm{~mm}$. Determine, in grams/hour, the rate at which water evaporates. Also determine how many water molecules evaporate in one second per $\mathrm{cm}^{2}$ of surface area.

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