Question

in 3 moles of ethane{ c₂h₆} calculate : no of moles of carbon atoms

: no of moles of hydrogen atoms

: no of moleules of ethane

Answer 1

Molecular formula of ethane = C₂H₆
Thus 1 molecule contains 2 atoms of C, i.e. 1 mole will contain 2 moles of C
hence 3 moles will contain = 6 moles of C atoms.

Similarly 1 molecule of ethane contains 6 atoms of H.
Hence 3 moles of ethane will contain 3 x 6 = 18 moles of H.

1 mole of ethane = 6.022 x 10²³ molecules of ethane
Thus 3 moles = 3 x 6.022 x 10²³ = 1.8 x 10²⁴ molecules of ethane.