In three moles of ethane , calculate the following

In three moles of ethane , calculate the following.
(i) Number of moles of carbons atoms.
(ii) Number of moles of hydrogen atoms.
(iii) Number of molecules of ethane

(i) 1 mole of $C _{ 2 }$ $H _{ 6 }$ contains 2 moles of carbon atoms.
.’. Number of moles of carbon atoms in 3 moles of $C _{ 2 }$ $H _{ 6 }$ = 2x3 = 6.
(ii) 1 mole of $C _{ 2 }$ $H _{ 6 }$ contains 6 moles of hydrogen atoms.
.’. Number of moles of hydrogen atoms in 3 moles of
$C _{ 2 }$ $H _{ 6 }$ = 3x6= 18.
(iii) 1 mole of $C _{ 2 }$ $H _{ 6 }$ contains 6.022 X ${{10}^{23}}$ molecules of ethane.

.’. Number of ethane molecules in 3 moles of $C _{ 2 }$ $H _{ 6 }$ = 3x 6.023x ${{10}^{23}}$
= 1.8069X ${{10}^{24}}$