Question

Two samples of gases $A$ and $B$ are taken.$A$ has an atomicity of $3$ whereas $B$ has an atomicity of $4$.Volume of $A$ and $B$ are $33.6$ litres.Now select the correct option:

• A. Both $A$ and $B$ have same number of gaseous atoms
• B. Both $A$ and $B$ have same number of gaseous molecules
• C. Both $A$ and $B$ have same number of gaseous moles
• D. All the above

Answer 1

Answer: (B), (C)

Both $A$ and $B$ have same number of gaseous molecules
Both $A$ and $B$ have same number of gaseous moles

For a gas $1mole$ occupies $22.4L$ volume.

Number of moles of gas $A_3$ in $33.6L=\frac{33.6}{22.4}=1.5mole$

Number of atoms of $A$ in gas $=1.5\times 3=4.5moles$

Number of moles of gas $B_4$ in $33.6L=\frac{33.6}{22.4}=1.5mole$

Number of atoms of $B$ in gas $=1.5\times 4=6.0moles$

Hence number of molecules are same for both gases in a same volume but atomic moles are different .