How many moles of hydrogen are needed to produce 13.78 mol of ethane?

This is an incomplete question, here is a complete question.

The following balanced equation shows the formation of ethane (C₂H₆).

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:

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 moles of hydrogen

Thus, the number of moles of hydrogen needed are, 27.56 mol

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-