The volume occupied by the molecules contained in 4.5 kg water at STP, if the intermolecular forces vanish awa

Question

The volume occupied by the molecules contained in 4.5 kg water at STP, if the intermolecular forces vanish away is

Accepted Answer

Using the ideal gas equation $PV = nRT$, where $n = \frac{	ext{mass of water}}{	ext{mol. wt.}} = \frac{4.5 	imes 10^3}{18} = 250 	ext{ moles}$. At STP, $T = 273 	ext{ K}$ and $P = 10^5 	ext{ N/m}^2$. Thus, $V = \frac{nRT}{P} = \frac{250 	imes 8.3 	imes 273}{10^5} \approx 5.66 	ext{ m}^3$.

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