Q1 / 150 · MHT CET 2026 (20 April Shift 2) · Chemistry
What is the number of molecules in 2.125 g of ammonia?
- A$6.022 \times 10^{23}$
- B$3.011 \times 10^{23}$
- C$1.505 \times 10^{22}$
- Correct answerD$7.527 \times 10^{22}$
Solution
Molar mass of ammonia ($NH_3$) = $14 + 3 = 17 \text{ g/mol}$
Number of moles of ammonia = $\dfrac{2.125}{17} = 0.125 \text{ mol}$
Number of molecules = $0.125 \times 6.022 \times 10^{23} = 7.527 \times 10^{22}$
Answer: $7.527 \times 10^{22}$
Number of moles of ammonia = $\dfrac{2.125}{17} = 0.125 \text{ mol}$
Number of molecules = $0.125 \times 6.022 \times 10^{23} = 7.527 \times 10^{22}$
Answer: $7.527 \times 10^{22}$
Hence, the correct answer is option: 'D'.