The formula of ethane is (CH3−CH3), i.e. It has two carbon atoms and each contain six electrons. Also, it has six hydrogen atoms, which contain 1 electron. Thus, total number of electrons =6+6+6=18 Therefore, one mole of ethane has Therefore, one mole of ethane has 18×6.02×1023=108.36×1023 i.e. 108.4×1023 electrons (∵1mol=6.02×1023 particles) Hence, (c) is the correct answer.