What is Percent yield: Definition and 15 Discussions

In chemistry, yield, also referred to as reaction yield, is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage. Yield is one of the primary factors that scientists must consider in organic and inorganic chemical synthesis processes. In chemical reaction engineering, "yield", "conversion" and "selectivity" are terms used to describe ratios of how much of a reactant was consumed (conversion), how much desired product was formed (yield) in relation to the undesired product (selectivity), represented as X, Y, and S.

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  1. I

    Is percent yield based on grams or moles?

    Is percent yield based on grams or moles? Thanks.
  2. Grace_314

    Chemistry BCA tables and Stoichiometry worksheet

  3. alphaj

    Percent yield crazy--help with calculations?

    Homework Statement Consider: 2 mol Reactant A (aq) + 3 mol Reactant B (aq) = 6 mol Product A (aq) + 1 mol Product B (s) You have 0.00075 L of a 0.0514M solution of Reactant A. In the lab, you combine it with 0.042 L of 0.0753M of Reactant B. You get a solid product and an aqueous product (a...
  4. L

    Percent Yield Calculation?

    Here is the question: If 75.0 g of potassium alum is obtained from 5.00 g of aluminum, what is the percent yield? This is what I've done so far, but I'm not sure if it is fully correct: 5.00g Al x (1/26.98156) x (1/1) x 258.207 = 47.84882537g potassium alum Wouldn't this then be the...
  5. J

    Percent Yield - Unsure of Which Molar Mass to Use

    Homework Statement A percent yield lab says to add 5.00 g of CuCl2•2H2O(s) to 50 mL of dissolved water. Then, add 1.0 g of steel wool (100% iron) to the beaker. I am trying to find out how many moles of CuCl2 react here. I am confused about the dihydrate. Homework Equations The reaction given...
  6. O

    Calculating Percent Yield of PbI2 in 2CsI + Pb(NO3)2 Reaction

    Homework Statement In one experiment, 22.9841 grams of 75.25% pure Pb(NO3)2 (pure Pb(NO3)2 has a molar mass of 331.2 grams) was mixed with 51.2354 grams of 81.21% pure CsI (pure CsI has a molar mass of 259.80992 grams): 2CsI(aq) + Pb(NO3)2(aq) → 2CsNO3(aq) + PbI2(s) After the reaction...
  7. P

    Finding percent yield of Alum?

    Homework Statement Find the percent yield of alum In an experiment to synthesize alum I started with 0.766g of aluminum and made 8.246g of alum Homework Equations 2Al + 6H20 + 2KOH ---> 2KAl(OH)4 + 3H2 The Attempt at a Solution First I find the LR. Which in this experiment is...
  8. O

    Percent yield questions

    % yield questions (URGENT) Homework Statement We have 3 equations: 1.64 g of an impure NaNO3-containing substance is reacted with Devarda's alloy. The amount of NH3 got from this reaction is reacted with 25cm3 1.00 moldm-3 H2SO4. The H2SO4 left over is reacted with 16.2 cm3 2.00 moldm-3 NaOH...
  9. B

    Greater than 100 percent yield (102%)

    Homework Statement Cu(s) + 4 HNO3 (aq) Cu(NO3)2 (aq) + 2 NO2 (g) + 2 H2O (l) Cu(No3)2 + 2NaOH -------> Cu(OH)2 + 2NaNO3 Cu(OH)2→CuO + H2O CuO + H2SO4 -> H2O + CuSO4 CuSO4(aq) + Zn ( s) ------- ZnSO4 (aq)+ Cu(s) I carried out the follow reactions using copper as an inital product and my...
  10. K

    Calculating % Yield of Ester in Chemistry Lab

    % yield ester I'm having a problem with my chemistry lab report. the question is: What would the % yield of ester be if the reaction were simply allowed to equilibrate (i.e. no products are removed)? I think the the yield is going to smaller but i don't know why. pls help
  11. G

    Producing Phosphoric Acid: Calculating Percent Yield

    Approximately 12 million kilograms of phosphoric acid (H3PO4) are produced annually for fertilizers, detergents, and agents for water treatment. Phosphoric acid can be prepared by heating the mineral fluoroapatite (Ca5(PO4)3F) with sulfuric acid in the presence of water. Ca5(PO4)3F + 5H2SO4 +...
  12. P

    Calculating Percent Yield of Al2O3

    Homework Statement If the reaction of 2.5 g of Al with 2.5 g of O2 produced 3.5 g of Al2O3, what is the percent yield of Al2)3? Be sure to write and balance equation. Homework Equations Percent Yield = (actual yield / theoretical yield ) x 100 The Attempt at a Solution 4Al + 302...
  13. C

    Theoretical Yield, Molar Mass, and Percent Yield

    Hi, I have a few questions that I am struggling with. Any help would be greatly appreciated. Question 1 Calculate the molar mass of calcium chloride dihydrate, CaCl2 • 2H2O. Please use the Periodic Table values rounded to the hundredths place for your calculation and round your answer to...
  14. I

    Chemistry Calculating Percent Yield in Moles: Is It Different?

    Is calculating the percent yield in moles different than calculating the percent yield in mass? I know that to calculate the percent yield in mass, you divide the actual over the theoretical and multiply by 100. There happens to be a side note in my homework saying that percent yiled can...
  15. S

    Factor(s) that affect percent yield

    Hi everyone, For a science lab, I am asked to find the following: What factor(s) affect percent yield in a reaction which produces calcium carbonate? We are given a selection of chemicals to use to get the CaCl_2 but I have chosen the following: CaCl_2 + Na_2CO_3 --> CaCO_3 + 2NaCl...