Chemical Kinetics

Consider the gaseous reaction,
\(A_2+B_2 \longrightarrow 2 A B\)
The following data was obtained for the above reaction.

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[A₂]₀	[B₂]₀	Initial rate of formation of AB (mol L⁻¹ s⁻¹)
0.1 M	0.1 M	2.5 × 10⁻⁴
0.2 M	0.1 M	5.0 × 10⁻⁴
0.2 M	0.1 M	1.0 × 10⁻³

The value of rate constant for the above reaction is