Question

Question A0.276 g piece of solid magnesium reacts with gaseous oxygen from the atmosphere to form solid magnesium oxide. In the laboratory a student weighs the mass of the magnesium oxide collected from this reaction as 0.304 g. 1st attempt Part 1 See Periodic Table The 0.276 g solid magnesium is the: Choose one: O A. actual yield. B. limiting reagent. C. excess reagent. O D. percent yield. O E. theoretical yield.

Answer 1

Percent Yield: .Percent ield is the percent vatio of actual vield to the thevretical ield .zt is calculated to be the experimental yield divided by the theoretical yield multiplied by 100%. the ·If the actual and theoretical yield are sam e , the Percent yield is100 %. Usually percent ield is lowe than 100y. because the actul vieid is often less then tie theoretical value. Reasos For this can include incomplete or compebn on competng. Yeactions and loss of sample during vecoverg. It's possible Fo percent yield to be over i007 w hich means more sample was recovered from a reaction than Predicted. This cahappen when othe v reactions were occurring tat also Formed the Product. can also be a Source of eror, if the excess is due to incomplete vemoval of wateγ or other impurities from the sanple. percent Yieldis always a Positive value Percent YieldActkal Yie ld X 100% Theoreti'cal Yield