At STP temperature, T=273.15K, pressure, P=101325Pa.
mass, m=75g and density, d=1.19g/l, R=8.315
number of moles,"n=PV\/RT"
"V=m\/d"
V=75/1.19= 63cm3
n=(101325*63*10-6)/(8.315*273.15)
n=2.81*10-3moles
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