00:01
This question deals with kinetics and the reaction that we're going on here is the oxidation or burning of methane gas.
00:10
When it burns and reacts with oxygen, it produces water and carbon dioxide, and here's our balanced reaction.
00:16
It's always nice to start with that.
00:18
We're also told the rate law for this reaction, that the rate equals the rate constant k times the concentration of the ch4 reactant to the first power because it's a first order reactant.
00:32
Sometimes, by the way, you don't even have to write if it's a first order reactant the exponential power for it because it's implied that if you don't write the exponent it's assumed then that it's a first order reactant.
00:46
Same thing is true of the oxygen here.
00:48
They are both first order reactants, and that's that's part of the question we needed to ask is each of these reactants then individually is a first order reactant.
00:58
So this reaction is first order with respect to the methane reactant, first order with respect to the oxygen reactant.
01:06
The overall order then simply involves adding those two orders together.
01:12
So overall, one plus one is two.
01:16
It's an overall second order reaction...