Answer :
Ethane is an alkane. Methane is also an alkane and is considered to be the simplest alkane. The difference is ethane has only 2 carbon. That carbon has 6 hydrogen attached to it. So what we do is we multiply the moles of ethane by the number of hydrogen (by dimension analysis) resulting to 82.68 moles H.
This is an incomplete question, here is a complete question.
The following balanced equation shows the formation of ethane (C₂H₆).
[tex]C_2H_2+2H_2\rightarrow C_2H_6[/tex]
How many moles of hydrogen are needed to produce 13.78 mol of ethane?
1) 3.445 mol
2) 6.890 mol
3) 27.56 mol
4) 55.12 mol
Answer : The number of moles of hydrogen needed are, (3) 27.56 mol
Explanation : Given,
Moles of ethane = 13.78 mol
The given balanced chemical reaction is:
[tex]C_2H_2+2H_2\rightarrow C_2H_6[/tex]
From the balanced chemical reaction we conclude that,
As, 1 mole of ethane produced from 2 moles of hydrogen
So, 13.78 mole of ethane produced from [tex]13.78\times 2=27.56[/tex] moles of hydrogen
Thus, the number of moles of hydrogen needed are, 27.56 mol