Question

Souring of wine occurs when ethanol is converted to acetic acid by oxygen by the following reaction: C2H5OH + O2 ---> CH3COOH + H2O. A 1.00 L bottle of wine, labeled as 8.5% (by volume) ethanol, is found to have a defective seal. Analysis of 1.00 mL showed that there were 0.0274 grams of acetic acid in that 1.00 mL. The density of ethanol is 0.816 g/mL and the density of water is 1.00 g/mL.

a. What mass of oxygen must have leaked into the bottle​

Answer 1

Take the reaction: NH3 + O2 NO + H2O. In an experiment, 3.25 g of NH3 are allowed to react with 3.50 g of O2.

a. Which reactant is the limiting reagent? O2

b. How many grams of NO are formed? 2.63 g NO

c. How much of the excess reactant remains after the reaction? 1.76 g NH3 left

If 4.95 g of ethylene (C2H4) are combusted with 3.25 g of oxygen.

a. What is the limiting reagent? O2

b. How many grams of CO2 are formed? 2.98 g CO2

Consider the reaction of C6H6 + Br2 C6H5Br + HBr

a. What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 73.0 g of Br2? 71.6 g C6H5Br

b. If the actual yield of C6H5Br is 63.6 g, what is the percent yield? 88.8%

Use the following reaction: C4H9OH + NaBr + H2SO4 C4H9Br + NaHSO4 + H2O If 15.0 g of C4H9OH react with 22.4 g of NaBr and 32.7 g of H2SO4 to yield 17.1 g of C4H9Br, what is the percent yield of this reaction?

61.6%

Silicon nitride (Si3N4) is made by a combining Si and nitrogen gas (N2) at a high temperature. How much (in g) Si is needed to react with an excess of nitrogen gas to prepare 125 g of silicon nitride if the percent yield of the reaction is 95.0%?

79.1 g Si

Souring of wine occurs when ethanol is converted to acetic acid by oxygen by the following reaction: C2H5OH + O2 CH3COOH + H2O. A 1.00 L bottle of wine, labeled as 8.5% (by volume) ethanol, is found to have a defective seal. Analysis of 1.00 mL showed that there were 0.0274 grams of acetic acid in that 1.00 mL. The density of ethanol is 0.816 g/mL and the density of water is 1.00 g/mL.

a. What mass of oxygen must have leaked into the bottle? 14.6 g O2

b. What is the percent yield for the conversion of ethanol to acetic acid if O2 is in excess? 30.3%

A reaction container holds 5.77 g of P4 and 5.77 g of O2.The following reaction occurs: P4 + O2 P4O6. If enough oxygen is available then the P4O6 reacts further: P4O6 + O2 P4O10.

a. What is the limiting reagent for the formation of P4O10? O2

b. What mass of P4O10 is produced? 5.78 g P4O10

c. What mass of excess reactant is left in the reaction container? 5.76 g P4O6 remain

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