Question

How many number of molecules and atoms respectively are present in $2.8$ litres of a diatomic gas at STP?

• A. $6.023 \times 10^{23},7.5 \times 10^{23}$
• B. $6.023 \times 10^{23},15 \times 10^{22}$
• C. $7.5 \times 10^{22},15 \times 10^{22}$
• D. $15 \times 10^{22},7.5 \times 10^{23}$

Answer 1

Answer: (C)

$7.5 \times 10^{22},15 \times 10^{22}$

Answer 2

(3) : Number of molecules of gas at STP

$= \frac{6.023 \times 10^{23} \times 2.8}{22.4} = 7.5 \times 10^{22}$molecules

Number of atoms in diatomic molecule

$= 2 \times 7.5 \times 10^{22}$

$= 15 \times 10^{22}$atoms