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Exam 4: Chemical Reactions

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Question 71

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Calculate the number of grams of solute in 500.0 mL of 0.189 mol L^-1 KOH.

A) 148 g
B) 1.68 g
C) 5.30 × g
D) 5.30 g
E) 1.68 × 10^-3 g

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Question 72

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How many grams of H₃PO₄ are in 265 mL of a 1.50 mol L^-1 solution of H₃PO₄ (aq)?

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Question 73

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Identify the coefficient of Fe₂O₃(s) when the following reaction is balanced,and determine the number of grams of MgO needed to produce 10.0 g of Fe₂O₃. (unbalanced) MgO(s) + Fe(s) → Fe₂O₃(s) + Mg(s)

42.6 g Cu are combined with 84.0 g of HNO₃ according to the reaction: 3 Cu + 8 HNO₃ → 3 Cu(NO₃) ₂ + 2 NO + 4 H₂O Which reagent is limiting and how many grams of Cu(NO₃) ₂ are produced?

Stoichiometric factor relates the amounts,in moles,of any two substances involved in chemical reaction.

A chemical equation is a shorthand way of representing a chemical reaction.

If 8.52 g each of zinc,potassium dichromate,and sulfuric acid are reacted by the reaction: 4 Zn + K₂Cr₂O₇ + 7 H₂SO₄→ 4 ZnSO₄ + 2 CrSO₄ +K₂SO₄ + 7 H₂O How many grams of potassium dichromate will be left unreacted?

What is the sum of the coefficients in the balanced equation that represents the complete combustion of the relatively new gasoline additive "MTBE," for which the molecular formula is C₅H₁₂O?

What volume of 6.0 M sulfuric acid is required for the preparation of 500.0 mL of 0.30 M solution?

5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below.Which one of the following statements is FALSE? 3 Fe(s) + 4 H₂O(l) → Fe₃O₄(s) + 4 H₂(g)

Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation? 2 S(s) + 3 O₂(g) + 4 NaOH(aq) → 2 Na₂SO₄(aq) + 2 H₂O(l)

If 294 grams of FeS₂ is allowed to react with 176 grams of O₂ according to the following unbalanced equation,how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

306 mL of a 0.208 M solution of silver nitrate will react with 146 mL of a 0.170 M solution of sodium phosphate to produce how many grams of silver phosphate precipitate? The balanced reaction is: 3 AgNO₃ + Na₃PO₄ → Ag₃PO₄ + 3 NaNO₃

When 31.2 mL of 0.500 mol L^-1 AgNO₃(aq) is added to 25.0 mL of 0.300 mol L^-1 NH₄Cl(aq) ,how many grams of AgCl are formed? AgNO₃(aq) + NH₄Cl(aq) → AgCl(s) + NH₄NO₃(aq)

The Haber Process for the production of ammonia is represented by: 3 H₂(g) + N₂(g) → 2 NH₃(g) If 30 g of hydrogen is mixed with 10 g of nitrogen and the extent of reaction is 0.247,what is the amount of ammonia produced?

Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid.What is the coefficient for sulfuric acid when the equation is balanced using the lowest,whole-number coefficients?

Potassium superoxide (KO₂) can simulate a plant-type action by consuming carbon dioxide (CO₂) gas and releasing oxygen (O₂) gas.The other product is potassium carbonate (K₂CO₃) .When the equation for this process is balanced,it shows that:

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? K₂O + H₂O → KOH

Nitroglycerin,used both in medicine and as an explosive,can be prepared by the carefully controlled reaction of glycerol (C₃H₈O₃) with nitric acid,as symbolized by: C₃H₈O₃ + 3 HNO₃ → C₃H₅N₃O₉ + 3 H₂O What mass of nitric acid is required for the production of 2.8 g of nitroglycerin by a process having a 67% yield?

How many millilitres of 0.260 mol L^-1 Na₂S(aq) are needed to react with 40.00 mL of 0.315 mol L^-1 AgNO₃(aq) ? Na₂S(aq) + 2 AgNO₃(aq) → 2 NaNO₃(aq) + Ag₂S(s)