A sample of gas has a mass of 0.555 g. Its volume is 117 mL at a temperature of 85 degrees C and a pressure of 753 mmHg. What is the molar mass of the gas?

1 Answer
anor277
Nov 18, 2017

We solve the Ideal Gas equation......and we know that #1*atm# will support a column of mercury that is #760*mm# high.....

i.e. #1*atm-=760*mm*Hg#

Explanation:

#n=(PV)/(RT)="Mass"/"Molar mass"#

And thus #"Molar mass"=(RT)/(PV)xx"mass"#

#(0.0821*(L*atm)/(K*mol)xx358.1*Kxx0.555*g)/((753*mm*Hg)/(760*mm*Hg*atm^-1)xx0.117*L)=??*g*mol^-1#....

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