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physgrl
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Homework Statement
A fixed mass of oxygen (O2, molecular mass = 32 g/mol) is contained in a cylinder whose volume is 2.80 liters. The pressure is 148 atm when the temperature is 23oC. Find the mass of oxygen in the cylinder.
a. 20 g
b. 80 g
c. 140 g
d. 280 g
e. 546 g
Homework Equations
PV=nRT
m=n*molar mass
The Attempt at a Solution
148atm*2.80L=n*8.314*296.15
n=0.17 moles
m=n*molar mass
m=0.17*32
m=5.5g
and that is not a possible answer :s