Nitrogen monoxide reacts with oxygen to give nitrogen dioxide. 2NO(g)+O2(g) 2NO2(g) The rate law is [NO]/

Question:

Nitrogen monoxide reacts with oxygen to give nitrogen dioxide.
2NO(g)+O2(g) → 2NO2(g)
The rate law is Δ[NO]/ Δt = k[NO]2[O2], where the rate constant is 1.16 × 105 L2/(mol2∙s) at 339oC. A vessel contains NO and O2 at 339oC. The initial partial pressures of NO and O2 are 155 mmHg and 345 mmHg, respectively. What is the rate of decrease of partial pressure of NO (in mmHg per second)?