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V= 0.500 l
P= 170 torr = 0,23
T= 25°C = 298°K
R=0,082
P*V=n*R*T
n= (P*V)/(R*T)
n=(0,23*0,500)/(0.082*25)
n=0,115 23,69
n= 0,0048