Question

Density of a gas at 300 K and 210 torr is 0.434 g.-. What is its molar mass?
(1) 14.78 g/mole
(2) 73.43 g/mole
(3) 38.68 g/mole
(4) 43.28 g/mole​

Answer 1

Answer:

density (d) = MP / RT  where M is molar mass, P is pressure, R is universal gas constant, T is temperature  we're finding M,

so:  M = pRT / P  

Given: d = 0.434  

P = 210 torr  

T = 300  

R for torr = 62.363  

M = (0.434 * 300 * 62.363) / 210  M = 38.67  

Molar mass = 38.67 g/mole

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