SOLUTION: A sample of cyclohexane gas occupies a volume of 250 mL at 75°C and a pressure of 1.40 atm. The mass of the gas is 1.030 g. What is the molar mass of cyclohexane? (VII-2) _____

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Question 169521: A sample of cyclohexane gas occupies a volume of 250 mL at 75°C and a pressure of 1.40 atm. The mass of the gas is 1.030 g. What is the molar mass of cyclohexane? (VII-2)
_____g/mol
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!

It follows Ideal Gas Law: ---> PV=nRT
where--->
Subst.:
%281.4%29%280.250%29=n%280.0821%29%2875%2B273.15%29
0.35=n%2828.583115%29 --->
n=0.0122449%28moles%29
.
We know that ---->n=mass%2FMolecularWeight
Then, MW=mass%2Fn=1.03%28grams%29%2F0.0122449%28moles%29
highlight%28MW=84.12%28grams%2Fmole%29%29,of Cyclohexane (Answer)
.
Thank you
Jojo