An experiment shows that a 115 mL gas sample has a mass of 0.170 g at a pressure of 701 mmHg and a temperature of 31 ∘C.?

What is the molar mass of the gas?

KennyB2016-04-19T11:57:38Z

First find moles:

n = PV/RT
P = 701 mm
V = 0.115 L
T = 304 K (you must use degrees K)
You need a value of R in L-torr/deg-mol and the answer will be in moles.

Divide the mass by the moles and you have g/mol which is the molar mass.

00

Roger the Mole2016-04-19T15:41:32Z

n = PV / RT = (701 mmHg) x (0.115 L) / ((62.36367 L mmHg/K mol) x (31 + 273) K) = 0.00425 mol

(0.170 g) / (0.00425 mol) = 40.0 g/mol

10

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