Calculate the number of moles in hydrogen . Contained in 18 litres of the gas at27 degree Celsius and 70 cm pressure further , if the mass of hydrogen takes as above is found to be 1.350 g. Calculate molar molecular mass of hydrogen.

According to ideal gas equationpV= nRTpV= wM × RTIts given thatp= 70 cm = 700 mm = 700760 atmV= 18 Lw= 1.350 gM= ?R= Gas constant = 0.0821 L atm /K/molT= 27 0C =27 + 273 = 300 KSubstituting all these valuespV= wM × RTM= wRTpV     =1.350 × 0.0821 × 300700760 × 18    = 2.0056 g
No of moles of hydrogen = Given mass/ molar mass = 1.350 / 2.005 = 0.6733

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