1. Molar mass of Demerol hydrochloride(C15H22ClNO2)
=15 x Molar mass of C+22 x Molar mass of H+ Molar mass of Cl+ Molar mass of N+2 x Molar mass of O
=15 x 12 g/mol+22 x 1 g/mol+35.5 g/mol+14 g/mol+2 x 16 g/mol
=180 g/mol+22 g/mol+35.5 g/mol+14 g/mol+32 g/mol
=283.5 g/mol
Mass of 0.028 mol of the sample=Number of moles x Molar mass=0.028 mol x 283.5 g/mol=7.938 g
2. Molar mass of Zn=65.4 g
Number of moles of Zn=Given mass/Molar mass
=25.0 g/65.4 g/mol=0.38 mol
As per the balanced chemical reaction
1 mol Zn forms 1 mol H2
So 0.38 mol Zn should form 0.38 mol H2
Now substitute P=Pressure=854 mm Hg=854 mm Hg/760 mm Hg/atm (1 atm=760 mm Hg)
n=Number of moles=0.38 mol
R=0.0821 Latm/molK
T=Temperature=T=25°C=25+273 K=298 K (0°C=273 K)
in PV=nRT (where V=Volume)
(854 mm Hg/760 mm Hg/atm) x V=0.38 mol x 0.0821 Latm/molK x 298 K
V=(0.38 mol x 0.821 Latm/molK x 298 K)/(854 mm Hv/760 mm Hg/atm)=8.27 L
So volume of H2 gas formed =8.27 L
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