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The graph is the rate curve for the following reaction carried out in an open...

The graph is the rate curve for the following reaction carried out in an open vessel. MgCO3 + 2HCl = MgCl2 + CO2 + H2O.
I) for how long did the reaction occur
Ii) why was there loss in the mass
Iii) state whether the reaction was faster at the beginning, the middle or towards the end of the reaction. Give reasons for your answer.
Iv) list 3 reaction conditions that can affect the slope of the curve?

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