Use the formula: pV = n RT, where n is the number of moles.

T = 363.2 + 273.15 = 636.35 K; R = 8.1345 J/(K* mol); p = 528 * 133.3 = 70382 Pa

V = 1 L = 1/1000 m^3.

n = pV/(RT) = (70382 * 1/1000) / (8.1345 * 636.35) = 0.01360 mol in 1.92 g

Then 1 mol is equivalent to 1.92 / 0.01360 = 141 g.

The molar mass is 141 g/mol.

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