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Question

Calculate the number of molecules in 0.71g of chlorine gas. Take Avogadro's number as 6×1023.


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Solution

Step 1: Given information

  • Mass of chlorine Cl2 gas is 0.71g
  • Avogadro's number is 6×1023

Step 2: Calculate the Number of molecules

The molecular mass of chlorine gas is 71g.

71g of Cl2 contains 6×1023 molecules.

0.71g of Cl2 contains 6×102371×0.71=6×1021molecules

Hence, the number of molecules in 0.71g of chlorine gas is 6×1021molecules.


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