A gas has a volume of 65 ml when measured at a pressure of .90 atm. If the temperature is 5°C, how many moles of the gas are there?

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Answer 1 · 2017-04-23T20:54:15

Approx. #2*mmol#.

We use the Ideal Gas equation..........

#n=(PV)/(RT)=(0.90*cancel(atm)xx0.065*cancelL)/(0.0821*cancel(L*atm*K^-1)*mol^-1xx278*cancelK)#

#~=2*mmol#

Note that we got an answer in #1/(mol^-1)=1/(1/(mol))=mol# as required. The calculation is thus dimensionally consistent.