Skip to content
doubtly
Sign up
Log in to upvote 0 Log in to downvote
Topic: Atomic and molecular masses, mole concept, molar mass· Some Basic Concepts in Chemistry

Among the following, choose the ones with equal number of atoms.A. 212 g of Na_2CO_3 (s) [molar mass = 106 g]B. 248 g of Na_2O (s) [molar mass = 62 g]C. 240 g of NaOH (s) [molar mass = 40 g]D. 12 g of H_2 (g) [molar mass = 2 g]E. 220 g of CO_2(g) [mo…

Among the following, choose the ones with equal number of atoms.

A. 212 g of \(\mathrm{Na_2CO_3}\) (s) [molar mass = 106 g]

B. 248 g of \(\mathrm{Na_2O}\) (s) [molar mass = 62 g]

C. 240 g of NaOH (s) [molar mass = 40 g]

D. 12 g of \(\mathrm{H_2}\) (g) [molar mass = 2 g]

E. 220 g of \(\mathrm{CO_2}\)(g) [molar mass = 44 g]

Choose the correct answer from the options given below :

1. A, B, and C only

2. A, B, and D only

3. B, C, and D only

4. B, D, and E only

Doubtly Asked NEET UG 2025 Practice test neet Save WhatsApp Report
Sign in to comment

1 answer

Log in to upvote 0 Log in to downvote

Best answer

Answer: 2. A, B, and D only

Key idea: number of atoms = moles \(\times\) atoms per formula unit \(\times N_A\).

  • A: 212 g = 2 mol \(\times\) 6 = 12 mol atoms.
  • B: 248 g = 4 mol \(\times\) 3 = 12.
  • C: 240 g = 6 mol \(\times\) 3 = 18.
  • D: 12 g = 6 mol \(\times\) 2 = 12.
  • E: 220 g = 5 mol \(\times\) 3 = 15.

A, B and D are equal: option (2).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
Was this answer helpful?
Sign in to comment

Your answer

Log in or create a free account to answer this question.