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The density of a gas of unknown molar mass was measured as a function of pressure at 0 °C, as in the table that follows. (a) Determine a precise molar mass for the gas. [Hint: Graph d/P versus P.] (b) Why is d/P not a constant as a function of pressure?

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Jamar Ferry
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A gas of unknown molar mass was allowed to effuse through a smallopening under constant pressure conditions. It required 184 s for1.00 L of this gas to effuse. Under identical experimentalconditions it required 506 s for 1.00 L of chlorotrifluoromethane(CClF3) gas to effuse. Calculate the molar mass of the unknown gas. (Remember that the faster the rate of effusion, the shorter thetime required for effusion; that is, rate and time are inverselyproportional.)

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What is the molar mass of the gas?

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Express the molar mass to three significant figures and include the appropriate units.

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Express the density to three significant figures and include the appropriate units.

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