69. Solving a chemistry problem

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A) Behind the course of the chemical reaction of the interaction of CaCO3 (T) with dilute hydrochloric acid:
CaCO3(t) 2HCl(aq) → CaCl2(aq) CO2(g) H2O(l)
the change in the volume of the emitted CO2 gas was monitored for equal time intervals. The following data was received:
t, s 0 15 30 45 50 100 ∞
VCO2, cm3 0 27 47 57 69 75 80
Determine the order of the reaction and calculate the rate constant of this reaction, assuming CaCO3 is taken in excess.