What would be the unit for the calculation of the rate of reaction? In a reaction between magnesium and hydrochloric acid, I measured the change in mass of the magnesium strip (Initial weight: 0.03g). I calculated the the time for the reaction to reach completion. A sample set of data we collected for during our investigation was: 

With 8 molar of HCl the reaction took an average of 15.49 seconds to completely evolve into hydrogen gas. 

To calculate the rate of reaction, I used the formula:



I suppose, change in mass would be 0.03 g as we went to the completion of the reaction, and change in time would be noted as the average time 15.49. My question is, what is the unit supposed to be in this formula?
The formula has been stated and you simply need to look out for the units of the quantities
 from the formula. Mass(g)/Time(s). Which is g/s.