The unique rate for the combustion of ethane is 0.44 M/s
(a) what is the rate that oxygen reacts?
(b) what is the rate of formation of water molecules?
Use the coefficients as you would for a stoichometry problem.
2C2H6 + 7O2 --> 4CO2 + 6H2O
0.44 x 7/2 = ?