Exam 5: Stoichiometry: Quantitative Information About Chemical Reactions

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An unknown diprotic acid (H2A)requires 31.81 mL of 0.109 M NaOH to completely neutralize a 0.685 g sample.Calculate the approximate molar mass of the acid.

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B

The compound P4S3 is used in matches.It reacts with oxygen to produce P4O10 and SO2.The unbalanced chemical equation is shown below. P4S3(s)+ O2(g)→ P4O10(s)+ SO2(g) What mass of SO2 is produced from the combustion of 0.401 g P4S3?

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A solution of sodium oxalate (Na2C2O4)in acidic solution is titrated with a solution of potassium permanganate (KMnO4)according to the following balanced chemical equation: 2KMnO4(aq)+ 8H2SO4(aq)+ 5Na2C2O4(aq)→ 2MnSO4(aq)+ 8H2O(l)+ 10CO2(g)+ 5Na2SO4(aq)+ K2SO4(aq) What volume of 0.0206 M KMnO4 is required to titrate 0.176 g of Na2C2O4 dissolved in 50.0 mL of solution?

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C

Hydrogen peroxide decomposes into oxygen and water.What mass of oxygen is formed from the decomposition of 125 g of hydrogen peroxide (H2O2)?

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Calibration of a spectrophotometer using a series of green dye containing solutions provides a set of data which follows the Beer-Lambert Law,with a trendline of y = 1.398 × 103x (y-axis = absorbance,x-axis = molar concentration).What is the molar concentration of a solution with an absorbance of 0.8427?

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One step in the isolation of pure rhodium metal (Rh)is the precipitation of rhodium(III)hydroxide from a solution containing rhodium(III)sulfate according to the following balanced chemical equation: Rh2(SO4)3(aq)+ 6NaOH(aq)→ 2Rh(OH)3(s)+ 3Na2SO4(aq) If 3.10 g of rhodium(III)sulfate reacts with excess sodium hydroxide,what mass of rhodium(III)hydroxide may be produced?

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How many moles of sodium bromide can be produced from the reaction of 1.03 moles of sodium with 0.650 moles of bromine gas? 2 Na(s)+ Br2(g)→ 2 NaBr(s)

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Which of the following is true about the actual yield of a product?

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In combustion analysis,the gases produced by the combustion of a hydrocarbon are passed through a tube containing finely divided sodium hydroxide supported on asbestos.The purpose of the sodium hydroxide is to absorb ________ produced by the combustion reaction.

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How many moles of Mg3P2(s)can be produced from the reaction of 0.14 mol Mg(s)with 0.020 mol P4(s)? 6 Mg(s)+ P4(s)→ 2 Mg3P2(s)

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Aspirin is produced by the reaction of salicylic acid (M = 138.1 g/mol)and acetic anhydride (M = 102.1 g/mol). C7H6O3(s)+ C4H6O3( Aspirin is produced by the reaction of salicylic acid (M = 138.1 g/mol)and acetic anhydride (M = 102.1 g/mol). C<sub>7</sub>H<sub>6</sub>O<sub>3</sub>(s)+ C<sub>4</sub>H<sub>6</sub>O<sub>3</sub>(   )→ C<sub>9</sub>H<sub>8</sub>O<sub>4</sub>(s)+ C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>(   ) If 2.04 g of C<sub>9</sub>H<sub>8</sub>O<sub>4</sub> (M = 180.2 g/mol)is produced from the reaction of 3.03 g C<sub>7</sub>H<sub>6</sub>O<sub>3</sub> and 4.01 g C<sub>4</sub>H<sub>6</sub>O<sub>3</sub>,what is the percent yield? )→ C9H8O4(s)+ C2H4O2( Aspirin is produced by the reaction of salicylic acid (M = 138.1 g/mol)and acetic anhydride (M = 102.1 g/mol). C<sub>7</sub>H<sub>6</sub>O<sub>3</sub>(s)+ C<sub>4</sub>H<sub>6</sub>O<sub>3</sub>(   )→ C<sub>9</sub>H<sub>8</sub>O<sub>4</sub>(s)+ C<sub>2</sub>H<sub>4</sub>O<sub>2</sub>(   ) If 2.04 g of C<sub>9</sub>H<sub>8</sub>O<sub>4</sub> (M = 180.2 g/mol)is produced from the reaction of 3.03 g C<sub>7</sub>H<sub>6</sub>O<sub>3</sub> and 4.01 g C<sub>4</sub>H<sub>6</sub>O<sub>3</sub>,what is the percent yield? ) If 2.04 g of C9H8O4 (M = 180.2 g/mol)is produced from the reaction of 3.03 g C7H6O3 and 4.01 g C4H6O3,what is the percent yield?

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The pH of an aqueous sodium hydroxide solution is 12.83.What is the hydronium ion concentration of this solution?

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What is the molarity of an NaI solution that contains 4.5 g of NaI in 21.0 mL of solution?

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Sulfur dioxide will react with water to form sulfurous acid (see balanced equation below). SO2(g)+ H2O(l)→ H2SO3(l) What mass of sulfur dioxide is needed to prepare 37.11 g of H2SO3(l)?

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Under certain conditions the reaction of ammonia with excess oxygen will produce a 29.5% yield of NO.What mass of NH3 must react with excess oxygen to yield 157 g NO? 4 NH3(g)+ 5 O2(g)→ 4 NO(g)+ 6 H2O(g)

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Calculate the number of moles of O2 required to react with phosphorus to produce 5.20 g of P4O6.(Molar mass P4O6 = 219.9 g/mol)

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A compound consists of only C and F.It contains 24% C by mass.What is the empirical formula of the compound?

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The percent yield of a chemical reaction is calculated by dividing the actual yield by the ________ yield and multiplying by 100%.

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What is the pH of 4.1 × 10−3 M HCl(aq)?

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A 2.197 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 4.197 g CO2 and 2.578 g H2O.What is the empirical formula of the compound?

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