Consider the balanced chemical reaction, 4 NH3(g) + 5 O2(g) \longrightarrow 4 NO(g) + 6 H2O(g)

if the rate of change of NH3 (∆[NH3]/∆t) is −2.6 x 10−3 M/s at a particular time, what is rate of the reaction at the same time?

a. 1.04x10−3 M/s

b. 6.5×10−4 M/s

c. −6.5×10−4 M/s

d. −1.04×10−3 M/s

e. 2.6 x 10−3 M/s