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Question -

In three moles of ethane (C2H6),calculate the following:

(i) Number of moles of carbon atoms.

(ii) Number of moles of hydrogen atoms.

(iii) Number of molecules of ethane.



Answer -

(i) 1 mole of C2H6 contains 2 molesof carbon atoms.

Number ofmoles of carbon atoms in 3 moles of C2H6

= 2 × 3 = 6

(ii) 1 mole of C2H6 contains 6 molesof hydrogen atoms.

Number ofmoles of carbon atoms in 3 moles of C2H6

= 3 × 6 = 18

(iii) 1 mole of C2H6 contains 6.023 ×1023 molecules of ethane.

Number ofmolecules in 3 moles of C2H6

= 3 × 6.023 × 1023 = 18.069× 1023

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