For every experiment there will always be a margin of error due to human, mechanical and procedure errors. In this experiment there could have been errors in reading the balance and burette. The balance was used more than once, thus; increasing the margin of error. The zinc chloride could have been left on the burner too long or not long enough. The excess water left behind, from not leaving the evaporating dish on the burner long enough, would have added to the mass of the zinc chloride. All of this is taken into consideration when the percent error was calculated by subtracting the actual yield (2.01g) from the predicted yield (2.13g) and dividing the difference by the predicted yield. The percent error of this experiment is 5.6%. The theoretical yield was obtained by multiplying the morality of the hydrochloric acid (.3M) by the amount of the solution in liters (.0104L) to the number of moles used (.0312moles). The number of moles was then multiplied by the molar ra!
             tio of zinc chloride to hydrochloric acid to determine the amount in moles. Using the molar mass of zinc chloride the number of moles was converted into grams resulting in 2.13 grams of zinc chloride. The actual yield was obtained by subtracting the mass of the evaporating dish (42.43g) from the mass of the evaporating + zinc chloride resulting in an actual yield of 2.01g of zinc chloride. The purpose statement was supported by the stoichiometry problem because the difference of the theoretical and actual yield is so small that it is accounted for in the percent error; therefore, the experiment was successful.
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