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Earlier discussion
3 older comments kept for context.
Favy
Mass/Molar mass = Volume at S.T.P/22.4dm³
22/44 = volume/22.4
Volume=22×22.4/44
=11.2dm³
Brown Brown
n=mass/Molar mass
n=volume/Molar volume
Molar mass of Propane CH3CH2CH3
36+8=44g/mol
22/44=v/22.4
1/2=v/22.4
V=22.4/2
V=11.2dm³
Oluwaseun Adeyemi
Molar mass of methane = 16g/mol
At S.T.P. its 8g occupies 11.2
so 16g occupies 22.4 dm\(^3\)
Molar mass of propane = 44g/mol\(^-1\) occupies 22.4dm\(^3\) at S.T.P
so 22g will occupy 11.2dm\(^3\)