An experiment shows that a 248-mL gas sample has a mass of 0.433 g at a pressure of 745 mm Hg and a temperature of 28°C. What is the molar mass of the gas?

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Answer 1 · 2018-05-31T07:04:31

#"Molar mass"~=100*g*mol^-1#

#PV=nRT="mass"/"molar mass"RT#

And thus #"molar mass"=(RT)/(PV)#

And so here....#"molar mass"=(0.0821*(L*atm)/(K*mol)xx301.1*K)/((745*mm*Hg)/(760*mm*Hg*atm^-1)xx0.248*L)#

#=??*g*mol^-1#

The key idea of this problem was the recognition that #760*mm*Hg-=1*atm#...and thus a unit of length was proportional to a unit of pressure....