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

C2H2 + 2H2 - C2H6

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

3,445 mol

6.890 mol

27.56 mol

55.12 mol

C

Explanation:

Well, we can see from the equation that hydrogen gas and ethane are in a 2:1 ratio based on their mole coefficients.

You need 2 mol H2 to make 1 mol C2H6. So that means you need 2*13.78 mol H2 to make 13.78 mol C2H6!

2*13.78 = 27.56 mol

C is correct.