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06-02-2020
Chemistry

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What is the molecular weight of a gas if a 12.0 g sample has a pressure of 836 mm Hg at 25.0°C in a 2.00 L flask? (R= 0.0821 L atm/ mol K)

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Eduard22sly Eduard22sly

06-02-2020

Answer: 133.3g/mol

Explanation:

Mass = 12g

V = 2L

R = 0.0821 L atm/ mol K

P = 836mmHg = 836/760 = 1.1atm

T = 25°C = 25 + 273 = 298K

n =?

n = PV /RT = (1.1x2)/(0.0821x298)

n = 0.09

Molar Mass = Mass / n

Molar Mass = 12/0.09

Molar Mass = 133.3g/mol

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