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Question:

If 3 moles of ethane (C2H6) are given, calculate the following: (i) Number of moles of carbon atoms. (ii) Number of moles of hydrogen atoms. (iii) Number of molecules of ethane.

Solution:

We are given 3 moles of ethane
(i) Number of moles of carbon atoms = 3 × 2 = 6 mol
(ii) Number of moles of hydrogen atoms = 3 × 6 = 18 mol
(iii) Number of molecules of ethane = 3 × 6.023 × 10^23 = 1.8069 × 10^24