Question

In three moles of ethane ($C_{2}H_{6}$), calculate the following:
(i) Number of moles of carbon atoms.
(ii) Number of moles of hydrogen atoms.
(iii) Number of molecules of ethane.

Answer 1

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(i) 6 moles of hydrogen 
(ii) 2 moles of carbon 
(iii) 1 mole of ethane

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Answer 2

(i) 1 mole of Ethane $C_{2} H_{6}$ contains 2 moles of carbon atoms (Since 2 carbons atoms are present in ethane)

∴ Number of moles of carbon atoms in 3 moles of $C_{2} H_{6}$  = 3 × 2 = 6 moles

(ii) 1 mole of Ethane $C_{2} H_{6}$ contains 6 moles of hydrogen atoms (Since6 hydrogen atoms are present in ethane)

∴ Number of moles of carbon atoms in 3 moles of  $C_{2} H_{6}$ = 3 × 6 = 18 moles

     (iii) Since 1 mole = $6.023\times 10^{23}molecules$

Therefore, 1 mole of Ethane $C_{2} H_{6}$ contains $6.023\times 10^{23}molecules$ molecules of ethane

∴ Number of molecules in 3 moles of ethane $C_{2} H_{6}$  = 3 × $6.023\times 10^{23}molecules$ = $18.069\times 10^{23}molecules$