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What Is the Molar Mass of an Unknown Gas If

Question 21

Multiple Choice

What is the molar mass of an unknown gas if 3.7 g of the gas occupies 450 mL at 20.0°C and 2.0 atm? The value of R = 0.0821 L atm mol^-1 K^-1.

A) 3.7 × 10^-2 g/mol
B) 9.9 × 10^-3 g/mol
C) 6.8 g/mol
D) 98.9 g/mol
E) 5.5 × 10³ g/mol

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