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p=1,22*10^5Pa=1220hPa
v=1dm3
m(dla 1dm3)=0,96g
R=83,14hPa*dm3/mol*K (stała gazowa)
pv=nRT => n=pv/RT => n=~0,05mol
0,05mol-0,96g
1mol - x
x=19,2g => x=M