Exam 4: Chemical Reactions and Stoichiometry

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + O(l) → (s) In a particular experiment, 5.00 g sample of CaO is reacted with excess water and 6.11 g of is recovered. What is the percent yield in this experiment?

What element is being reduced in the following (unbalanced) redox reaction? MnO₄⁻ (aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution?

Based on the balanced chemical equation shown below, determine the molarity of a solution containing Fe²⁺(aq) if 40.00 mL of the Fe²⁺(aq) solution is required to completely react with 30.00 mL of a 0. 250 mol L^-1 potassium bromate, KBrO₃(aq), solution. The chemical equation for the reaction is: 6Fe²⁺(aq) + BrO₃^-(aq) + 6H⁺(aq) → 6Fe³⁺(aq) + Br^-(aq) + 3H₂O(l)

Identify the balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.

Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide: (aq) + (aq) → (s) Lead iodide is virtually insoluble in water so that the reaction appears to go to completion. How many millilitres of 3.550 mol L^-1 HI(aq) must be added to a solution containing 0.700 mol of to completely precipitate the lead?

How many moles of LiI are contained in 258.6 mL of a 0.0296 mol L^-1 LiI solution?

A solution is prepared by mixing 70.0 mL of 0.100 mol L^-1 HCl and 30.0 mL of 0.200 mol L^-1 NaCl. What is the molarity of chloride ion in this solution?

Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of are needed to react with 0.400 mol of lithium?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

How many litres of a 0.0550 mol L^-1 KCl solution contain 0.163 moles of KCl?

How many grams of NaCl are required to make 250.0 mL of a 3.000 mol L^-1 solution?

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many moles of are produced by the decomposition of 2.54 mol of sodium azide?

What are the required coefficients to properly balance the following chemical reaction? SO₂(g) + O₂(g) + H₂O(l) → H₂SO₄(aq)

Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in this fashion?

Identify the balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

What are the required coefficients to properly balance the following chemical reaction? N₂H₄(l) → NH₃(g) + N₂(g)

How many moles of NaCl are required to make 250 mL of a 3.00 mol L^-1 solution?

In an acid-base neutralization reaction, 38.74 mL of 0.500 mol L^-1 potassium hydroxide reacts with 50.00 mL of sulfuric acid solution. What is the concentration of the H₂SO₄ solution?

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H⁺ and Fe³⁺ in the balanced reaction? Fe²⁺(aq) + MnO₄⁻(aq) → Fe³⁺(aq) + Mn²⁺(aq)