Question

The number of atoms in 0.1 mol triatomic gas is (N_A= 6.02 × 10²³mol⁻¹)

A	6.026 × 1022

B	1.806 × 1023

C	3.6 × 1023

D	1.8 × 1022

Answer 1

The triatomic gas of a triatomic molecule means that the number of atoms present in one molecule of the gas is 3.

As we know that there is Avogadro’s number of molecules in one mole of gas. So we have $N_A=6.023\times {10}^{23}$ molecules in one mole of gas.

0.1 mole of gas present, so the number of molecules in 0.1 moles of the gas is:

=0.1×NAN_A

​$N_A$=0.1×6.02×${10}^{23}$ =6.02×${10}^{22}$

we know that there are 3 atoms present in one molecule.

So the number of atoms present in 0.1 moles of the gas is:

=3×6.02×${10}^{22}$ =18.06×${10}^{22}$ =1.806×${10}^{23}$

Therefore, the number of atoms in 0.1 mol triatomic gas is 1.806×${10}^{23}$