In an urban atmosphere the concentration of CH4 and OH radical is 5 x 1019 molecules m3 and 1.8 x 1012 molecules m-3 respectively. The rate constant for 2nd order reaction between OH and methane is 8.36 x 10-21 m3 mol-1s-1. What is the instantaneous rate of oxidation of CH4?
1
3.26 × 1011 molecules m-3s-1
2
2.52 × 1012 molecules m-3s-1
3
7.52 × 1011 molecules m-3s-1
4
7.52 × 1012 molecules m-3s-1