55. Solving a chemistry problem

6. The interaction reaction between substances A and B proceeds according to the following equation: A + 2B = C, the initial concentrations are as follows: CA = 8 mol / l; Sv = 10 mol / l. The reaction rate constant is 0.3 l 2 mol-2 s-1. Calculate 1) the rate of the chemical reaction at the initial moment; 2) the rate of a chemical reaction at the moment when 30% of substance B remains in the reaction mixture.