Question

Calculate the number of molecules of CH4 in 40g of CH4.​

Answer 1

Answer:

First of all, number of atoms in a methane molecule: 1+4=5

Gram molar mass: 12 +4(1)=16

No. Of moles of methane in 40 gram sample :

40÷16= 2.5

Hence no. Of methane molecules in 40gm sample 2.5×NA

2.5×6.023×10^23

15.0575×10^23 molecules.

No. Of atoms= 1.50575×5×10^24

=7.53×10^24 atoms