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Exam 4: Chemical Reactions and Stoichiometry

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Question 31

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What is the concentration (M)of sodium ions in 4.57 L of a 1.25 mol L^-1 $\mathrm { Na } _ { 3 }$ P solution?

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Question 32

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If the percent yield for the following reaction is 65.0%,how many grams of KClO₃ are needed to produce 32.0 g of O₂? 2KClO₃(s) → 2KCl(s) + 3O₂(g)

A) 53.1 g
B) 81.7 g
C) 126 g
D) 283 g

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Question 33

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How many moles of Co²⁺ are present in 0.150 L of a 0.200 mol L^-1 solution of CoI₂?

H Br ,HI ,H NO₃,Na Br ,and KNO₃ are all classified as

How many grams of NaOH (MW = 40.0)are there in 250.0 mL of a 0.275 mol L^-1 NaOH solution?

How would the concentration change if a 1.0 L flask of 1.0 mol L^-1 NaCl were left uncapped on a laboratory bench for several days? Why?

Identify the percent yield when 28.16 g of CO₂ are formed from the reaction of 8.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Determine the theoretical yield of H₂S (in moles) if 4.0 mol Al₂S₃ and 4.0 mol H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is Al₂S₃ = 150.17 g mol^-1. Al₂S₃(s) + 6H₂O(l) → 2Al(OH) ₃(s) + 3H₂S(g)

Which of the following is an oxidation-reduction reaction?

According to the following reaction,what mass of PbCl₂ can form from 235 mL of a 0.110 mol L^-1 KCl solution? Assume that there is excess Pb(NO₃) ₂. 2KCl(aq) + Pb(NO₃) ₂(aq) → PbCl₂(s) + 2KNO₃(aq)

What element is being oxidized in the following (unbalanced) redox reaction? H₂O₂(l) + ClO₂(aq) → ClO₂^- (aq) + O₂(g)

What is the concentration of FeCl₃ in a solution prepared by dissolving 20.0 g of FeCl₃ in enough water to make 275 mL of solution?

Determine the theoretical yield of HCl if 60.0 g of BCl₃ and 37.5 g of H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl₃ = 117.16 g mol^-1. BCl₃(g) + 3H₂O(l) → H₃BO₃(s) + 3HCl(g)

A 14.01 g sample of N₂ reacts with 3.02 g of H₂ to form ammonia (NH₃) .If ammonia is the only product,what mass of ammonia is formed?

A stock solution of $\mathrm { HNO } _ { 3 }$ is prepared and found to contain 13.7 mol L^-1 of $\mathrm { HNO } _ { 3 }$ .If 25.0 mL of the stock solution is diluted to a final volume of 0.500 L,what is the concentration of the diluted solution?

How many of the following compounds are insoluble in water? KC₂H₃O₂ CaSO₄ SrS AlPO₄

Which of the following describes HCl?

What precipitate is most likely formed from a solution containing Ba²⁺,Na¹⁺,OH^1-,and CO₃^2-.

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO(s) + $\mathrm { H } _ { 2 }$ O(l) ? $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ (s) In a particular experiment,5.00 g sample of CaO is reacted with excess water and 6.11 g of $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ is recovered.What is the percent yield in this experiment?

A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl₃) .If it is the only product,what mass of PCl₃ is formed?