By signing in you confirm you are 18 or older, or have your parent’s or guardian’s consent.

NDA 2 2024 GAT, question 60

Topic: Chemistry

Q60

The mass of 0.5 mole0.5\text{ mole} of N2N_{2} gas is

  1. (a) 7 g7\text{ g}
  2. (b) 14 g14\text{ g}Correct answer
  3. (c) 21 g21\text{ g}
  4. (d) 28 g28\text{ g}

Solution.

Answer: (b) 14 g14\text{ g}

  1. The molar mass of N₂ is 2×14=28 g mol⁻¹.
  2. Mass=nM=0.5×28=14 g.
  3. Using 14 g mol⁻¹ would incorrectly treat nitrogen gas as monatomic.