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NDA 2016 GAT · General Knowledge · Mole Concept and States of Matter · hard

The number of molecules in 4.4 g of carbon dioxide is (Avogadro number = 6.022 × 10²³; atomic masses C = 12, O = 16)

Single correct option

The number of molecules in 4.4 g of carbon dioxide is (Avogadro number = 6.022 × 10²³; atomic masses C = 12, O = 16)
  1. A. 6.022 × 10²²
  2. B. 6.022 × 10²³
  3. C. 6.022 × 10²¹
  4. D. 2.64 × 10²⁴
Show answer and solution

Answer: (A) 6.022 × 10²²

Molar mass of CO₂ = 12 + 32 = 44 g/mol. Moles in 4.4 g = 4.4/44 = 0.1 mol. Number of molecules = 0.1 × 6.022 × 10²³ = 6.022 × 10²². Choosing 6.022 × 10²³ means treating the sample as one mole, which would require 44 g.
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Original question written in the NDA 2016 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake