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V=30cm3=0,03dm3
T=293K
p=1013hPa
R=83,1hPa*dm3/mol*K
W tym zadaniu stosujemy równanie Clapeyrona:
p*V=n*R*T
n=p*V/R*T=1013*0,03/83,1*293=0,00125mola
M SO2=32+2*16=64g/mol
m=n*M=0,00125*64=0,08g SO2