Balance the following reaction. a coefficient of "1" is understood. choose option "blank" for the correct answer if the coefficient is "1."

c2h6 + o2 → co2 + h2o

2 C₂H₆ + 7 O₂ = 4 CO₂ + 6 H₂O

Reagents:

C = 2 x 2 = 4
H = 2 x 6 = 12
O = 7 x 2 = 14

 4 + 12 + 14 = 30

Products:

C = 4 x 1 = 4
O = 4 x 2 = 8
H = 6 x 2 = 12
O = 6 x 1 = 6

4 + 8 + 12 + 6 = 30

hope this helps!