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Four identical 1.0-L flasks contain the gases He, Cl2, CH4, and NH3, each at 0°C and 1 atm pressure. Which gas sample has the greatest number of molecules?

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PV = nRT. Solve for n
n = PV/RT
You know P, V, R, and T, and all or them are the same; therefore, n must be ......

na

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