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Percent Yield

#### Q. Industrially, vanadium metal, which is used in steel alloys, can be obtained by reacting vanadium (V) oxide with calcium at high temperatures: 5 Ca + V2O5 --> 5 CaO + 2 V In one process, 1.540x10^3 g of V2O5 react with 2.100x10^3 g Ca (a) Calculate the theoretical yield of V. (b) Calculate the percent yield if 797.0 g of V are obtained.

Solved • May 2, 2020

Percent Yield

#### Q. Write out the balanced chemical equation for HCl and Ca(OH)2. How much CaCl2 is formed from 5 grams HCl? What is the percent yield if you recovered 3.55 grams from the reaction?

Solved • May 1, 2020

Percent Yield

#### Q. You start with a 2.25g piece of copper wire. You mix it in a bucket of nitric acid. At the end of the reaction, you weighed out 3.35g of copper (II) nitrate. What is the percent yield of the reaction?

Solved • Apr 13, 2020

Percent Yield

#### Q. A 56.0 mL sample of a 0.118 M potassium sulfate solution is mixed with 39.5 mL of a 0.104 M lead(II) acetate solution and the following precipitation reaction occurs: K2SO4(aq) + Pb(C2H3O2)2 (aq) → 2KC2H3O2(aq) + PbSO4(s) The solid PbSO4 is collected, dried, and found to have a mass of 0.992 g. Determine the percent yield.

Solved • Mar 13, 2020

Percent Yield

#### Q. The chemist discovers a more efficient catalyst than can produce ethyl butyrate with a 78.0% yield. How many grams would be produced from 8.20 g of butanoic acid and excess ethanol? Express your answer in grams to three significant figures.

Solved • Mar 12, 2020

Percent Yield

#### Q. A chemist ran the reaction and obtained 5.10 g of ethyl butyrate. What was the percent yield? Express your answer as a percent to three significant figures.

Solved • Mar 12, 2020

Percent Yield

#### Q. Urea (CH4N2O) is a common fertilizer that can be synthesized by the reaction of ammonia (NH3) with carbon dioxide as follows: 2NH3(aq) + CO2(aq) + CO2(aq) → CH4N2O(aq) + H2O(l) In an industrial synthesis of urea, a chemist combines 129.6 kg of ammonia with 211.4 kg of carbon dioxide and obtains 161.5 kg of urea. Determine the percent yield for the reaction. Express your answer using three significant figures.

Solved • Mar 12, 2020