GENERAL CHEMISTRY I
CHEM 1311.004 (12680)
EXAM 2
Monday, June 18, 2012
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Part 1: Grams, Moles and Particles
1.
How many lead atoms are present in 4.216 moles of lead? Avogadro’s Number is 6.022 x 1023.
a) 5.817 x 1023 atoms
b) 8.263 x 1023 atoms
c) 2.539 x 1024 atoms
d) 5.102 x 1024 atoms
Comment [D1]: Answer
e) 8.651 x 1024 atoms
2.
How many moles of magnesium are present if you have 1.560 x 1025 magnesium atoms?
Avogadro’s Number is 6.022 x 1023.
a) 4.682 mol
3.
b) 6.993 mol
b) 8.552 g
e) 25.91 mol
Comment [D2]: Answer
c) 17.21 g
d) 28.06 g
e) 40.02 g
Comment [D3]: Answer
How many moles are iron are present in 72.47 g of iron? The atomic weight of iron is 55.845 g/mol.
a) 1.298 mol
5.
d) 16.82 mol
How many grams of titanium are present in 0.5863 moles of titanium? The atomic weight of titanium is 47.867 g/mol.
a) 4.128 g
4.
c) 9.739 mol
b) 2.873 mol
c) 4.278 mol
d) 7.316 mol
e) 11.23 mol
Comment [D4]: Answer
How many aluminum atoms are present in 542.3 g of aluminum? Avogadro’s Number is 6.022 x 10 23.
The atomic weight of aluminum is 26.982 g/mol.
a) 8.932 x 1023 atoms
b) 3.184 x 1024 atoms
c) 7.482 x 1024 atoms
d) 1.210 x 1025 atoms
Comment [D5]: Answer
25
e) 4.265 x 10 atoms
6.
What is the mass of 4.173 x 1024 silicon atoms? Avogadro’s Number is 6.022 x 1023.
The atomic weight of silicon is 28.085 g/mol.
a) 38.16 g
7.
c) 79.12 g
d) 104.2 g
e) 194.6 g
How many moles of H2O are present in 155.4 g of H2O? Atomic weights: H 1.008 g/mol
a) 2.738 mol
8.
b) 55.19 g
b) 4.572 mol
Comment [D6]: Answer
O 15.999 g/mol
e) 19.20 mol
Comment [D7]: Answer
d) 16.31 g
e) 25.47 g
Comment [D8]: Answer
c) Ba2Cl
d) Ba2Cl3
e) Ba3Cl2
Comment [D9]: Answer
c) Mg2N
d) Mg2N3
e) Mg3N2
Comment [D10]: Answer
c) Na2S
d) Na2S3
e) Na3S2
Comment [D11]: Answer
c) Al2P
d) Al2P3
e) Al3P2
Comment [D12]: Answer
c) Al2O
d) Al2O3
e) Al3O2
Comment [D13]: Answer
c) Ca2S
d) Ca2S3
e) Ca3S2
Comment [D14]: Answer
c) 8.626 mol
d) 12.87 mol
23
23
What is the mass of 3.485 x 10 CO2 molecules? Avogadro’s Number is 6.022 x 10 .
Atomic weights: C 12.011 g/mol
O 15.999 g/mol
a) 2.733 g
b) 5.101 g
c) 11.22 g
Part 2: Nomenclature of Binary Ionic Compounds
9.
What is the formula of barium chloride?
a) BaCl
10.
a) MgN
11.
b) AlP2
What is the formula of aluminum oxide?
a) AlO
14.
b) NaS2
What is the formula of aluminum phosphide?
a) AlP
13.
b) MgN2
What is the formula of sodium sulfide?
a) NaS
12.
b) BaCl2
What is the formula of magnesium nitride?
b) AlO2
What is the formula of calcium sulfide?
a) CaS
b) CaS2
15.
What is the formula of sodium phosphide?
a) NaP
16.
b) Na2P
c) Na3P
d) NaP2
e) NaP3
Comment [D15]:
c) Sr3Br
d)SrBr2
e) SrBr3
Comment [D16]: Answer
Comment [D17]: Answer
What is the formula of strontium bromide?
a) SrBr
b) Sr2Br
Part 3: Nomenclature of Ionic Compounds Containing Polyatomic Ions
17.
What is the formula of sodium carbonate?
a) NaCO3
18.
d) K(ClO)2
e) K2(ClO)2
c) NH4(NO3)2
d) NH4(NO)3
e) (NH)4NO3
c) Ba(NO2)2
d) Ba(NO)2
e) Ba2(NO)2
Comment [D20]: Answer
c) Al(SO3)2
d) Al2(SO3)3
e) Al3(SO3)2
Comment [D21]: Answer
c) Ca2ClO4
d) Ca(ClO)4
e) Ca2(ClO)4
Comment [D22]: Answer
c) Sr2PO4
d) Sr2(PO4)3
e) Sr3(PO4)2
Comment [D23]: Answer
c) K2SO4
d) K2(SO4)3
e) K3(SO4)2
Comment [D24]: Answer
Comment [D18]: Answer
b) (NH4)2NO3
Comment [D19]: Answer
b) Ba2NO2
b) Al2SO3
b) Ca(ClO4)2
What is the formula of strontium phosphate?
a) SrPO4
24.
c) K(ClO2)2
What is the formula of calcium perchlorate?
a) CaClO4
23.
b) K2ClO2
What is the formula of aluminum sulfite?
a) AlSO3
22.
e) Na3(CO3)2
What is the formula of barium nitrite?
a) BaNO2
21.
d) Na2(CO3)3
What is the formula of ammonium nitrate?
a) NH4NO3
20.
c) Na(CO3)2
What is the formula of potassium chlorite?
a) KClO2
19.
b) Na2CO3
b) Sr(PO4)2
What is the formula of potassium sulfate?
a) KSO4
b) K(SO4)2
Part 4: Ions Having 2 Common Charges – The Stock and -ic/-ous Systems of Nomenclature
25.
What is the formula of chromium(III) sulfide?
a) CrS
26.
a) FeO
27.
31.
b) Fe2O
b) Pb2O
b) Cu2Cl
+
e) Cr3S2
Comment [D25]: Answer
c) FeO2
d) Fe2O3
e) Fe3O2
Comment [D26]: Answer
c) PbO2
d) Pb4O
e) PbO4
Comment [D27]: Answer
e) Cu3Cl2
Comment [D28]: Answer
e) Au3O2
Comment [D29]: Answer
c) CuCl2
d) Cu2Cl3
3+
Gold forms the ions Au and Au . What is the formula of auric oxide?
a) AuO
30.
d) Cr2S3
Copper forms the ions Cu+ and Cu2+. What is the formula of cuprous chloride?
a) CuCl
29.
c) CrS3
What is the formula of lead(IV) oxide?
a) PbO
28.
b) Cr3S
What is the formula of iron(II) oxide?
b) Au2O
2+
c) AuO2
d) Au2O3
3+
Manganese forms the ions Mn and Mn . Which of the following would be a correct name for MnBr 2
(in the Stock and/or -ic/-ous systems of nomenclature)?
a) manganese(II) bromide
b) manganese (III) bromide
d) both a and c
e) both b and c
c) manganous bromide
Comment [D30]: Answer
Tin forms the ions Sn2+ and Sn4+. Which of the following would be a correct name for SnF2
(in the Stock and/or -ic/-ous systems of nomenclature)?
a) tin(II) fluoride
b) tin(IV) fluoride
d) both a and c
e) both b and c
c) stannic fluoride
Comment [D31]: Answer
32.
Cobalt forms the ions Co2+ and Co3+. Which of the following would be a correct name for CoCl2
(in the Stock and/or -ic/-ous systems of nomenclature)?
a) cobalt(III) chloride
b) cobaltous chloride
d) both a and b
e) both a and c
c) cobaltic chloride
Comment [D32]: Answer
e) H2NO3
Comment [D33]: Answer
Part 5: Acid Nomenclature
33.
What is the formula of nitrous acid?
a) HNO2
34,
35.
37.
39.
b) hydrosulfurous acid
d) sulfurous acid
e) hyposulfuric acid
c) sulfuric acid
Comment [D34]: Answer
What is the formula of phosphoric acid?
b) H2PO4
c) H3PO4
d) H4PO4
e) H5PO4
Comment [D35]: Answer
c) chloric acid
Comment [D36]: Answer
e) HCO4
Comment [D37]: Answer
What is the name of HCl?
a) hydrochloric acid
b) hydrochlorous acid
d) chlorous acid
e) hypochloric acid
What is the formula of carbonic acid?
b) H2CO2
c) HCO3
d) H2CO3
What is the name of HClO2?
a) hydrochloric acid
b) hydrochlorous acid
d) chlorous acid
e) hypochloric acid
c) chloric acid
Comment [D38]: Answer
What is the formula of hydrosulfuric acid?
a) HS
40.
d) H2NO2
a) hydrosulfuric acid
a) HCO2
38.
c) HNO4
What is the name of H2SO3?
a) HPO4
36.
b) HNO3
b) H2S
c) HSO3
d) H2SO3
e) HSO4
Comment [D39]: Answer
c) chromic acid
Comment [D40]: Answer
What is the name of H2CrO4?
a) hydrochromic acid
b) hydrochromous acid
d) chromous acid
e) hypochromic acid
Part 6: Acid Salts
41.
What is the formula of potassium dihydrogen phosphate?
a) KH2PO4
42.
a) Ca(CO3)2
43.
e) K2H2PO4
Comment [D41]: Answer
b) CaHCO3
c) Ca(HCO3)2
d) CaH2CO3
e) Ca(H2CO3)2
Comment [D42]: Answer
b) Al(HSO3)2
c) Al(HSO3)3
d) Al(H2SO3)2
e) Al(H2SO3)3
Comment [D43]: Answer
b) Mg2HPO4
c) Mg(HPO4)2
d) MgH(PO4)2
e) MgH(PO4)3
Comment [D44]: Answer
c) Na2HSO4
d) NaH2SO4
e) Na2H2SO4
Comment [D45]: Answer
d) Ba(HS)2
e) Ba(H2S)2
Comment [D46]: Answer
What is the formula of sodium bisulfate?
a) Na(SO4)2
46.
d) K2HPO4
What is the formula of magnesium monohydrogen phosphate?
a) MgHPO4
45.
c) K(H2PO4)2
What is the formula of aluminum bisulfite?
a) Al(SO3)2
44.
b) K(HPO4)2
What is the formula of calcium bicarbonate?
b) NaHSO4
What is the formula of barium hydrogen sulfide?
a) BaHS
b) BaHS2
c) BaH2S
Part 7: Mass Percentage Calculations
47.
What is the percent by mass of sodium in NaCl? Atomic weights: Na 22.990 g/mol
a) 15.41%
48.
49.
c) 39.34%
d) 57.22%
Cl 35.453 g/mol
e) 73.19%
What is the percent by mass of hydrogen in CH4? Atomic weights: C 12.011 g/mol
H 1.008 g/mol
a) 12.83%
e) 79.20%
b) 25.13%
c) 41.47%
d) 59.72%
Comment [D47]: Answer
Comment [D48]: Answer
How many grams of nitrogen are present in 75.00 g of NH3? Atomic weights: N 14.007 g/mol
H 1.008 g/mol
Hint: Use the chemical formula to find the mass percent of nitrogen in NH3, then calculate that percentage of 75.00 to find
the number of grams of nitrogen in 75.00 g of NH3.
a) 18.25 g
50.
b) 24.16%
b) 31.06 g
c) 40.14 g
d) 49.98 g
e) 61.68 g
Comment [D49]: Answer
Mercuric oxide, HgO, is a compound of the elements mercury and oxygen. When heated, the compound decomposes. The
oxygen escapes as a gas, leaving a puddle of liquid mercury. How many grams of this compound would you have to
decompose in order to get 10.00 g of liquid mercury? Atomic weights: Hg 200.59
O 15.999
Hint: Use the formula HgO to calculate the mass percentage of mercury in this compound. Then determine how many grams
of compound you would need to start with so that when you take that percentage of it, the result is 10.00 g.
a) 10.80 g
b) 15.38 g
c) 24.37 g
d) 39.15 g
e) 55.20 g
*** END OF EXAM 2 ***
The remaining pages on this exam provide supplemental data to help you work the problems.
Comment [D50]: Answer