Some Basic Concepts of Chemistry Part 1

Combustion of ethane,

C2H6

3g

+5O2⟶2CO2+

3H2O

0.3‌mol

30gC2H6 produce ⟶3mol of H2O 3gC2H6 produce
⟶0.3mol of H2O
Now, mole of ethane =‌

3g

30gmol−1

=0.1mol
Hence, 0.1 mol of ethane gives
=03NA molecules of water
=0.3×6.023×1023 molecules of H2O
=18.06×1022
=18×1022
Thus, ethane gives 18 molecules of H2O.