Question

100 mL O₂ and H₂ are kept at the same temperature and pressure. What is true about their number of molecules?

• A. \(N_{\text{O}_2} > N_{\text{H}_2}\)
• B. \(N_{\text{O}_2} < N_{\text{H}_2}\)
• C. \(N_{\text{O}_2} = N_{\text{H}_2}\)
• D. NO₂ + NH₂ = 1mole

Hint:

Gas identity does not affect molecule count at fixed T,P,V.

Answer 1

The Correct Option is C

Step 1: By Avogadro’s law, equal volumes of gases at same T and P contain equal number of molecules.