• # question_answer 18) In three moles of ethane $({{C}_{2}}{{H}_{6}}),$ calculate the fallowing: (i) No. of moles of carbon atoms (ii) No. of moles of hydrogen atoms (iii) No. of molecules of ethane

(i) $\because$ 1 mole ${{C}_{2}}{{H}_{6}}$ contains 2 mole carbon atoms $\therefore$ 3 mole ${{C}_{2}}{{H}_{6}}$ will contain 6 mole carbon atoms (ii) $\because$1 mole ${{C}_{2}}{{H}_{6}}$contains 6 moles of hydrogen atoms $\therefore$ 3 mole ${{C}_{2}}{{H}_{6}}$will contain 18 moles of hydrogen atoms (iii) 3 mole of ${{C}_{2}}{{H}_{6}}$ will contain $3\text{ }\times \text{ }6.023\text{ }\times \text{ }{{10}^{23}}$ molecules