Question

A sample of ethane has same mass as 10^7 molecules of CH4. How many
C2H6 molecules does the sample contain?​

Answer 1

Answer:

The answer is 5.34×10^8 molecules.

Explanation:

Let mass of 10^7 molecules of CH4 =m.

m/16=10^7/6.023×10^-23.(moles concept=wt/mol.mass=no of molecules/Avagadro's no)

Hence m=(16×10^7)/6.023×10^-23.

Masses are equal so..here na is Avagadro's no.

(16×10^7)/30na×na = no of molecules of ethane= 5.34 ×10^8(Ans)