What is the molecular weight of a gas if a 21.0 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)
A) 243 amu
B) 1.89 amu
C) 234 amu
D) 11.1 amu
E) none of the above
Answer: C
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