The balanced equation shows the formation of ethane open paren cap c sub 2 cap h sub 6 close paren cap c sub 2 cap h sub 2 plus 2 cap h sub 2 rightarrow cap c sub 2 cap h sub 6 How many moles of hydrogen are needed to produce 13 point 7 8 mol of ethane?

The balanced equation shows that 2 mol of hydrogen produce 1 mol of ethane. Multiply 13.78 mol ethane by the ratio 2 mol H₂ per 1 mol ethane: 13.78 × 2 = 27.56 mol H₂. Therefore, the correct choice is 27.56 mol.

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