Question

A certain amount of N2 gas at 27 degree celsius is measured for Pressure in a gas monometer . The Pressure observed is 800 mm of Hg . If aqueous tension at this temperature is 20mm of Hg.Find the mass of gas if its volume is 2l.

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Answer 1

Answer:

Required pressure p = given pressure - aquas tension

p = 800 - 20

p = 780 mm of Hg

PV = nRT

780 X 2 = n x 8.314 j/mol.k  x 300 k

1560/8.314 x 300 = n

0.625 moles

now moles = given mass/ molar mass

0.625  x 28 = 17.5

17.5 g would be the answer

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