- Type the answer (value only) in the boxes below for the following questions given the equation below: 2 C2H6 (g) + 7 02 (g) 6 H20 (g) + 4 CO2 (g) a) When (O2) is decreasing at 0.07 mol/L.S, how fast is [H20] increasing? b) When (CO2) is increasing at 0.26 mol/L.s, how fast is (C2H6] decreasing