A certain reaction `A + B rarr` Products is first order w.r.t. each reactant with `k = 5.0 xx 10^(-3) M^(-1) s^(-1)`. Calculate the concentration of `A` remaining after `100s` if the initial concentration of `A` was `0.1 M` and that of `B` was `6.0 M` State any approximation made in obtaining your result.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Write the Rate Law
For the reaction \( A + B \rightarrow \text{Products} \), the rate law can be expressed as:
\[ \text{Rate} = k [A][B] \]
where \( k = 5.0 \times 10^{-3} \, M^{-1} s^{-1} \).
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