gas has the
same mass as 1.5 x 1020 molecules of methane 
. How many 
molecules
does the sample of gas contain?
Answer:
6.022 x 1023 molecules
of methane have mass = molar mass of methane 
=
12 + 4 x 1 = 16 g
molecules of
methane have mass
This is also the mass of ethane 
Molar mass of ethane 
As 30 g of
ethane has number of molecules = 6.022 x 1023
of ethane has
number of molecules 
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