CALCULATE NUMBER of molecules in 22.4 litres of water at STP

Question

ipwnbunnies · Answer

This is a special case that's good to know, I think. At STP, a mole of gas has a volume of 22.4 L. We can show this mathematically with the Ideal Gas Equation:
$$PV = nRT$$
$$n = \frac{PV}{RT}$$
$$n = \frac{(1 atm)(22.4 L)}{(0.08206 L-atm/mol K)(273 K)}$$

ipwnbunnies · Answer

$$n = 1 mol * 6.02e23 \frac{molecules}{mol} = 6.02e23 molecules$$

koikkara · Answer

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