Explanation:

In three moles of ethane c2h6 calculate the following I number of moles of carbon atoms II number of moles of hydrogen atoms iii number of molecules of ethane

Given:2 mole of c2H4

So, 1 mole of C2H4 contain 2 mole of carbon and 4mole of hydrogen

Then, 2mole of C2H4 contain 4mole of carbon and 8mole of hydrogen

1mole C2H4 -> 2 mole Carbon

2mole C2H4 -> 2×2/1 = 4mole carbon

1mole C2H4 -> 4 mole carbon

2mole C2H4 ->2×4/1 = 8 mole hydrogen

Or use this technique

1C2H4 = 2mole carbon, 4mole hydrogen

2 C2H4 = 4 mole carbon, 8 mole hydrogen

Hope it helped u dear friend