The initial rate of disappearance of H₂ is 7.5 x 10⁻² M/s. What is the initial rate of appearance of NH₃?

a. 1.1 x 10⁻¹ M/s
b. 5.0 x 10⁻² M/s
c. 7.5 x 10⁻² M/s
d. 3.8 x 10⁻² M/s

3H2 + N2 --> 2NH3 ???

( 2/3)7.5 *10^-2 = 5 * 10^-2