Multiple choice

44 gm of carbon dioxide at STP contain

  1. 6.02*1023 molecules

  2. 3.01*1022 molecules

  3. 6.02*1024 molecules

  4. 3.01*1023 molecules
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A Correct answer
Explanation

The molar mass of CO2 is 44g/mol (12 for carbon + 2×16 for oxygen). At STP (Standard Temperature and Pressure), one mole of any gas occupies 22.4 liters and contains Avogadro's number of molecules (6.02 × 10^23). Therefore, 44g of CO2 at STP equals exactly one mole, which contains 6.02 × 10^23 molecules.

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