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21. How many moles of Carbon are in 36.0 g of Carbon? 1.5 moles 3.0 moles...

21. How many moles of Carbon are in 36.0 g of Carbon?
1.5 moles
3.0 moles
36 moles
432 moles
22. How many grams of Nitrogen gas are found in 22.4 L of Nitrogen gas?
14 g
28 g
20 g
56 g
23.What is the percent sodium in sodium chloride?
60.7%
30%
70%
39.3%
24.If you do a lab that burns Magnesium in pure Oxygen what would the empirical formula of the compound be if you started with 0.6 g Magnesium and 0.4 g of Oxygen?
Mg2O2
Mg2O3
MgO
Mg3O2
25.If a compound is 5.9% H and 94.1% O what is the molecular formula if the molar mass is 34 g/mol?
H2O2
HO
H3O
H2O
26. Why do we balance chemical equations?
Law of Conservation of Energy
Law of Conservation of Momentum
Law of Conservation of Charge
Law of Conservation of Mass
27. Once balanced, what is the coefficient of HCl in the following reaction:

Mg + HCl → MgCl2 + H2

1
3
2
0
28.Predict and balance the following reaction:

Ag + Cu(NO3)2 →

Ag + Cu(NO3)2 → Cu + Ag(NO3)2
The reaction does not occur.
2Ag + Cu(NO3)2 → Cu + 2AgNO3
Ag + Cu(NO3)2 → Ag + Cu(NO3)2
29. Predict and balance the following reaction:

Cu3(PO4)2 + Fe(OH)3 →

Cu3(PO4)2 + 2Fe(OH)3 → FeCu3 + (PO4)2(OH)3
Cu3(PO4)2 + Fe(OH)3 → FePO4 + Cu(OH)2
Cu3(PO4)2 + 2Fe(OH)3 → 2FePO4 + 3Cu(OH)2
Cu3(PO4)2 + 2Fe(OH)3 → 2Fe(PO4)3 + 3Cu(OH)3
30. Predict and Balance the following reaction:

Na + H2O →

Na + H2O → NaOH2
2Na + 2H2O → 2NaOH + H2
2Na + H2O → Na2O + H2
No Reaction Occurs
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Homework Answers

Answer #1

Q21. Correct answer is (B) 3.0 moles

Q22. Correct answer is (B) 28 g

Q23. Correct answer is (D) 39.3 %

Q24. Correct answer is (C) MgO

Q25. Correct answer is (A) H2O2

Q26. Correct answer is (D) Law of conservation of Mass

Q27. Correct answer is (C) 2

Q28. Correct answer is (B) The reaction does not occur

Q29. Correct answer is (C) Cu3(PO4)2 + 2 Fe(OH)3 → 2 FePO4 + 3 Cu(OH)2

Q30. Correct answer is (B) 2 Na + 2 H2O \rightarrow 2 NaOH + H2

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