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In three moles of ethane \(\left(\mathrm{C}_2 \mathrm{H}_6\right)\), calculate the following :
(i) Number of moles of carbon atoms.
(ii) Number of moles of hydrogen atoms.
(iii) Number of molecules of ethane.
(i) Number of moles of carbon atoms.
(ii) Number of moles of hydrogen atoms.
(iii) Number of molecules of ethane.
Solution:
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(i) 1 mole of \(\mathrm{C}_2 \mathrm{H}_6\) contains 2 moles of carbon atoms.
Hence 3 moles of \(\mathrm{C}_2 \mathrm{H}_6\) will contain \(\mathrm{C}\)-atoms \(=6\) moles.
(ii) 1 mole of \(\mathrm{C}_2 \mathrm{H}_6\) contains 6 moles of hydrogen atoms. Hence 3 moles of \(\mathrm{C}_2 \mathrm{H}_6\) will contain \(\mathrm{H}\)-atoms \(=18\) moles.
(iii) 1 mole of \(\mathrm{C}_2 \mathrm{H}_6\) contains \(6.02 \times 10^{23}\) molecules. Hence 3 moles of \(\mathrm{C}_2 \mathrm{H}_6\) will contain ethane molecules \(=3 \times 6.02 \times 10^{23}=18.06 \times 10^{23}\) molecules.
Hence 3 moles of \(\mathrm{C}_2 \mathrm{H}_6\) will contain \(\mathrm{C}\)-atoms \(=6\) moles.
(ii) 1 mole of \(\mathrm{C}_2 \mathrm{H}_6\) contains 6 moles of hydrogen atoms. Hence 3 moles of \(\mathrm{C}_2 \mathrm{H}_6\) will contain \(\mathrm{H}\)-atoms \(=18\) moles.
(iii) 1 mole of \(\mathrm{C}_2 \mathrm{H}_6\) contains \(6.02 \times 10^{23}\) molecules. Hence 3 moles of \(\mathrm{C}_2 \mathrm{H}_6\) will contain ethane molecules \(=3 \times 6.02 \times 10^{23}=18.06 \times 10^{23}\) molecules.
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