9. Solving a chemistry problem
5. The reaction between substances A and B proceeds according to the equation A(g) 2B(g) → D. The initial concentrations are: [A]= 0.3 and [B] - 0.5 mol/l. The reaction rate constant is 0.4. Calculate the initial speed of the chemical and the speed at the time when the concentration of substance A decreases to 0.1 mol.
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