5.6 litre of gas at stp is 11.5 g . name the gas?

1 Answer
Junaid Mirza
May 13, 2018

Ethanol

Explanation:

#1# mol of any gas at #"STP"# occupies #22.4\ "L"# of volume.

Let’s see how many mols of gas will occupy #5.6# litres of volume at #"STP"#

#5.6 cancel"L" × "1 mol"/(22.4 cancel"L") = 1/4\ "mol"#

So, we conclude that #"11.5 g"# is one-fourth of molar mass (mass of one mole) of gas.

Molar mass of gas#= 4 × "11.5 g = 46.0 g"#

Ethanol (#"C"_2"H"_5"OH"#) has molar mass #"46.0 g/mol"#. So, the gas is ethanol.

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