For questions 13-14, use the information provided below from the experiment Identification of an Unknown. The...

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Chemistry

For questions 13-14, use the information provided below from theexperiment Identification of an Unknown. The molecular masses andreactions are provided for you.
NaHCO₃Â Â Â Â Â Â Â Â Â KHCO₃Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Na₂CO₃Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â K₂CO₃Â Â Â Â Â Â Â Â Â Â Â Â Â NaClÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â KClÂ Â Â Â Â Â Â Â Â Â
84.01 g/molÂ Â Â Â 100.12 g/molÂ Â 105.99 g/molÂ Â 138.21g/molÂ Â 58.44 g/molÂ Â Â Â 74.55g/mol
2 NaHCO₃ (s) Ã Na₂CO₃ (s) + H₂O (g) +CO₂(g)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (Reaction 1)
Na₂CO₃ (s) +2HCl(aq) Ã 2NaCl (s) + H₂O (l) + CO₂(g)Â Â Â Â Â Â Â Â (Reaction2)
13.Â Â Â Â Â Â Brad starts with 0.652 gof unknown. How much mass should he have after the first heatingstep if his unknown
Â Â Â Â Â Â Â Â Â Â Â was NaHCO₃?
Â Â Â Â Â Â Â Â Â Â Â A. Â Â Â Â Â Â 0.411 gNa₂CO₃
Â Â Â Â Â Â Â Â Â Â Â B.Â Â Â Â Â Â Â Â 0.326 gNa₂CO₃
Â Â Â Â Â Â Â Â Â Â Â C.Â Â Â Â Â Â Â Â 0.822 gNa₂CO₃
Â Â Â Â Â Â Â Â Â Â Â D.Â Â Â Â Â Â Â 0.00402 gNa₂CO₃
14. Â Â Â Â Â If Brad has a final mass of0.270 g at the end of the experiment (after the 2^ndheating), what is his percent yield
Â Â Â Â Â Â Â Â Â Â Â of the final salt? (Assuming he starts with 0.652 g ofNaHCO₃).
Â Â Â Â Â Â Â Â Â Â Â A. Â Â Â Â Â 40%
Â Â Â Â Â Â Â Â Â Â Â B.Â Â Â Â Â Â Â Â 60%
Â Â Â Â Â Â Â Â Â Â Â C.Â Â Â Â Â Â Â Â 80%
Â Â Â Â Â Â Â Â Â Â Â D.Â Â Â Â Â Â Â 86%
Â Â Â Â Â Â Â Â Â Â Â
15.Â Â Â Â Â Â What is theconcentration of chloride ions in 50.0 mL of a 5.25 M solution ofbarium chloride?
Â Â Â Â Â Â Â Â Â Â Â A. Â Â Â Â Â Â 0.525 MCl^-
Â Â Â Â Â Â Â Â Â Â Â B.Â Â Â Â Â Â Â Â 1.05 MCl^-
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â C. Â Â Â Â Â Â Â 5.25 MCl^-
Â Â Â Â Â Â Â Â Â Â Â D.Â Â Â Â Â Â Â 10.5 MCl^-
Aqueous Solutions
16.Â Â Â Â Â Â Which of the followingrepresents a correct precipitation reaction between sodium iodideand lead(IV) sulfate?
Â Â Â Â Â Â Â Â Â Â Â A.Â Â Â Â Â Â Â PbSO₄ (aq)+ NaI(aq) Ã PbI (aq) + NaSO₄ (aq)
Â Â Â Â Â Â Â Â Â Â Â B.Â Â Â Â Â Â Â Â PbSO₄(aq) + NaI(aq) Ã PbI (s) + NaSO₄ (aq)
Â Â Â Â Â Â Â Â Â Â Â C.Â Â Â Â Â Â Â Â Pb(SO₄)₂(aq) + NaI (aq) Ã PbI₂ (s)+ Na₂SO₄ (aq)
Â Â Â Â Â Â Â Â Â Â Â D.Â Â Â Â Â Â Â Pb(SO₄)₂(aq) + NaI (aq) Ã PbI₂(aq) + Na₂SO₄ (aq)
17.Â Â Â Â Â Â How many of thefollowing salts would not form a precipitate in an aqueoussolution?
A. Â Â Â Â Â one
B. Â Â Â Â Â Â two
C.Â Â Â Â Â Â Â Â three
D.Â Â Â Â Â Â Â four
18.Â Â Â Â Â Â What type of reaction isthefollowing?Â Â Â Â Â Â Â Â Â Â CaCO₃ + heat Ã CaO + CO₂
Â Â Â Â Â Â Â Â Â Â Â A. Â Â Â Â Â Â Combination
Â Â Â Â Â Â Â Â Â Â Â B.Â Â Â Â Â Â Â Â Decomposition
Â Â Â Â Â Â Â Â Â Â Â C.Â Â Â Â Â Â Â Â SingleReplacement
Â Â Â Â Â Â Â Â Â Â Â D.Â Â Â Â Â Â Â Combustion
19.Â Â Â Â Â Â Calculate the amount ofcopper recovered from an 85% yield if the theoretical yield is 0.25g
Â Â Â Â Â Â Â Â Â Â Â A.Â Â Â Â Â Â Â 21 g
Â Â Â Â Â Â Â Â Â Â Â B.Â Â Â Â Â Â Â Â 3.4 g
Â Â Â Â Â Â Â Â Â Â Â C.Â Â Â Â Â Â Â Â 0.21 g
Â Â Â Â Â Â Â Â Â Â Â D.Â Â Â Â Â Â Â 0.34 g
20.Â Â Â Â Â Â Which of the followingchemical species is the oxidizing agent in the reaction below?
Cu (s) + 4 HNO₃ (aq) â†’Cu(NO₃)₂ (aq) + 2 NO₂ (g) + 2H₂O (l)
A. Â Â Â Â Â Cu (s)
B. Â Â Â Â Â Â HNO₃ (aq)
C. Â Â Â Â Â Â Cu(NO₃)₂ (aq)
D. Â Â Â Â Â NO₂ (g)

Answer & Explanation Solved by verified expert

4.3 Ratings (583 Votes)

13 the first reaction is 2 NaHC03 Na2C03 H20 C02 we know that moles mass molar mass so moles of NaHC03 taken 0652 84 moles of NaHC03 taken 776 x 103 now from the first reaction we can see that moles of Na2C03 formed 05 x moles See Answer

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