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

(i) 1 mole of `C_(2)H_(6)` contains 2 moles of carbon atoms .
`therefore ` Number of moles of carbon atoms in 3 moles of `C_(2)H_(6)`
`=2xx3 =6`
(ii) 1 mole of `C_(2) H_(6)` contains 6 moles of hydrogen atoms .
`therefore ` Number of moles of carbon atoms in 3 moles of `C_(2)H_(6)`
`3xx6=18`
(iii) 1 mole of `C_(2)H_(6)` contains `6.023xx10^(23)` molecules of ethane.
`therefore ` Number of molecules in 3 moles of `C_(2)H_(6)`
`=3xx6.023 xx 10^(23)`