Question

In three moles of ethane (C2H6), calculate the number of moles of hydrogen atoms.

Answer 1

1 molecule of ethane contains 6 hydrogen atoms  

so 3 moles of ethane contains 18 mole of hydrogen atoms.

Answer 2

There are six atoms of hydrogen in each molecules of C2H6 hence 1 mole of C2H6 will have 6 moles of hydrogen atoms.

So that Number of moles of carbon atoms in 3 moles of C2H6 = 3 × 6 = 18 moles

1 mole of C2H6  contains 6 moles of Hydrogen atoms

∴ 3 moles of of C2H6  will contain 18 moles of Hydrogen atoms