Calculate the number of moles of hydrogen(H2) present in a 500 cm3 sample of hydrogen gas at a pressure of 760 mm Hg at 27 C.

Calculate the number of moles of hydrogen(H2) present in a 500 cm3 sam

1.	Calculate the number of moles of hydrogen(H2) present in a 500 cm3 sample of hydrogen gas at a pressure of 760 mm Hg at 27 C.
Answer» Solution: The data given in the problem isP = 760mm of HG = 1 atm V = 500CM3 T = 270C T = 27+ 273 = 300 K R = 82.1 cm3 K-1mol-1 number of moles of hydrogen (n) = ? According to IDEAL gas equation PV= nRT n = PV/RT = 1 atm X 500 cm3 /82.1 cm3 K-1mol-1 X 300 K n = 0.023mol