homeworkchapter07.htmlTEXTsfri6bЂܽP F.J. DeHoratius Chapter 7 Homework Mod Chem

Chapter 7 Homework

Naming Compounds, Writing Formulas,

Percentage Composition, Empirical Formulas,

Molecular Formulas


Homework 7.1

1. Write the correct formula for the compounds formed between the following elements:

a) potassium and iodine soln
b) magnesium and chlorine soln
c) sodium and sulfur soln
d) aluminum and sulfur soln
e) aluminum and nitrogen soln

2. Give the correct name for the compounds indicated by the following formula:

a) AgCl soln
b) ZnO soln
c) CaBr2 soln
d) SrF2 soln
e) BaO soln
f) CaCl2 soln

3. What are monatomic ions?

4. Using only the periodic table, write the symbol and charge of the ion most typically formed by each of the following elements:
a) K
b) Ca
c) S
d) Cl
e) Ba
f) Br

5. Write the correct formula for the compounds formed between the following elements:
a) sodium and iodine soln
b) calcium and sulfur soln
c) zinc and chlorine soln
d) barium and fluorine soln
e) lithium and oxygen soln

6. Write the correct formula and give the names of the compounds formed by the following ions:
a) Cr2+ and F1- soln
b) Ni2+ and O2- soln
c) Fe3+ and O2- soln

Homework 7.2

1. Write the formula and give the name for the compounds formed between the following ions:
a) Cu2+ and Br1- soln
b) Fe2+ and O2- soln
c) Pb2+ and Cl1- soln
d) Hg2+ and S2- soln
e) Sn2+ and F1- soln
f) Fe3+ and O2- soln

2. Give the names for the following compounds using the Stock System where appropriate:
a) CuO soln
b) CoF3 soln
c) SnI4 soln
d) FeS soln

3. What is the significance of a chemical formula?

4. Name the following compounds using the Stock system where appropriate:
a) NaI soln
b) MgS soln
c) CaO soln
d) K2S soln
e) CuBr soln
f) FeCl2 soln

5. Write the correct formula for the following compounds formed between the following elements:
a) sodium and iodine soln
b) calcium and sulfur soln
c) zinc and chlorine soln
d) barium and fluorine soln
e) lithium and oxygen soln

6. Give the correct name for each of the following using the Stock System where appropriate:
a) KCl soln
b) CaBr2 soln
c) Li2O soln
d) MgCl2 soln

7. Write the correct formulae and give the correct names for each of the following:
a) Cr2+ and F1- soln
b) Ni2+ and O2- soln
c) Fe3+ and O2- soln

8. Write the correct chemical formula for each of the following:
a) sodium fluoride soln
b) calcium oxide soln
c) potassium sulfide soln
d) magnesium chloride soln
e) aluminum bromide soln
f) lithium nitrate soln
g) iron (II) oxide soln

Homework 7.3

1. Write the correct chemical formula for each of the following:
a) sodium iodide soln
b) calcium chloride soln
c) potassium sulfide soln
d) lithium nitrate soln
e) copper (II) sulfate soln
f) sodium carbonate soln
g) calcium nitrite soln
h) potassium perchlorate soln

2. Give the correct chemical names for each of the following using the Stock System where appropriate:
a) Ag2O soln
b) Ca(OH)2 soln
c) KClO3 soln
d) NH4OH soln
e) FeCrO4 soln
f) KClO soln

Homework 7.4

1. Name the following compounds:
a) SO3 soln
b) ICl3 soln
c) PBr5 soln

2. Write the correct formula for each of the following:
a) carbon tetraiodide soln
b) phosphorus trichloride soln
c) dinitrogen trioxide soln

3. In naming and writing formulae for binary molecular compounds, what determines the order in which the component elements are written?

4. Correctly name the following molecular compounds using the Prefix system:
a) CO2 soln
b) CCl4 soln
c) PCl5 soln
d) SeF6 soln
e) As2O5 soln

5. Name each of the compounds in number 5 above using the Stock system soln.

6. Write the correct formula for each of the following:
a) carbon tetrabromide soln
b) silicon dioxide soln
c) tetraphosphorus decoxide soln
d) diarsenic trisulfide soln

Homework 7.5

1. Distinguish between binary acids and oxyacids, and give two examples of each.

2. a) Define salt.
b) Give two examples of salts.

3. Correctly name each of the following acids:
a) HF soln
b) HBr soln
c) HNO3 soln
d) H2SO4 soln
e) H3PO4 soln


4. Give the correct chemical formula for each of the following:
a) sulfurous acid soln
b) chloric acid soln
c) hydrochloric acid soln
d) hypochlorous acid soln
e) perchloric acid soln
f) carbonic acid soln
g) acetic acid soln

Homework 7.6

1. Assign oxidation numbers to each atom in the following compounds:
a) HCl soln
b) CF4 soln
c) PCl3 soln
d) SO2 soln
e) HNO3 soln
f) KH soln
g) P4O10 soln
h) HClO3 soln
i) N2O5 soln
j) GeCl2 soln

2. Assign oxidation numbers to each atom in the following compounds or ions:
a) HF soln
b) CI4 soln
c) H2O soln
d) PI3 soln
e) CS2 soln
f) Na2O2 soln
g) H2CO3 soln
h) NO21- soln
i) SO42- soln
j) ClO21- soln
k) IO31- soln

3. Write the correct formula for each of the following:
a) phosphorus (III) iodide soln
b) sulfur (II) chloride soln
c) carbon (IV) sulfide soln
d) nitrogen (V) oxide soln

4. Name each of the following using the Stock system:
a) Co(NO3)2 soln
b) FePO4 soln
c) Hg2SO4 soln
d) Hg3(PO4)2 soln

5. Assign oxidation numbers to each atom in the following compounds:
a) HI soln
b) PBr3 soln
c) GeS2 soln
d) KH soln
e) As2O5 soln
f) H3PO4 soln

6. Name each of the following compounds using the Stock system where appropriate:
a) MgI2 soln
b) NaF soln
c) CS2 soln
d) N2O4 soln
e) SO2 soln
f) PBr3 soln
g) CaCl2 soln
h) AgI soln

Homework 7.7

1. Name the following compounds using the Stock system:
a) CI4 soln
b) SO3 soln
c) As2S3 soln
d) NCl3 soln

Homework 7.8

1. Find the formula mass of each of the following:

a) H2SO4 (98.09g) soln
b) Ca(NO3)2
(164.10g) soln
c) PO43-
(94.97g) soln
d) MgCl2
(95.21g) soln

Homework 7.9

1. How many moles of atoms of each element are there in one mole of the following compounds?
a) Al2S3 soln
b) NaNO3 soln
c) Ba(OH)2 soln

2. Find the molar mass of each of the compounds listed in question 1 above.
(a:150.01g; b:85.00g; c:171.35g) soln

3. Determine both the formula mass and molar mass of ammonium carbonate, (NH4)2CO3.
(96.11) soln

4. Determine the number of moles of each type of monatomic or polyatomic ion in one mole of the following compounds:
a) KNO3 soln
b) Na2SO4 soln
c) Ca(OH)2 soln
d) (NH4)2SO3 soln
e) Ca3(PO4)2 soln
f) Al2(CrO4)3 soln

5. Determine the formula mass and molar mass of each of the following compounds:
a) XeF4
(207.29g) soln
b) C12H24O6
(264.36) soln
c) Hg2I2
(654.98) soln
d) CuCN
(89.57) soln

Homework 7.10

1. How many moles are there in the following:
a) 6.60 g (NH4)2SO4
(0.0499 mol) soln
b) 4.5 g Ca(OH)2
(0.061 mol) soln

2. How many molecules are there in the following:
a) 25.0 g H2SO4
(1.53x1023 molecules) soln
b) 125 g C12H22O11
(2.20x1023 molecules) soln

3. What is the mass in grams of 6.25 mol of Cu(NO3)2?
(1170 g) soln

4. How many moles of atoms of each element are there in one mole of (NH4)2CO3? soln

5. What is the mass in grams of 3.25 mol Fe2(SO4)3?
(1300 g) soln

6. How many moles of molecules are there in 250 g of hydrogen nitrate, HNO3?
(4.0 mol) soln

7. How many molecules of aspirin, C9H8O4, are there in 10.00 g tablet of aspirin?
(3.341x1022 molecules) soln

8. Determine the formula mass of each of the following compounds:
a) C6H12O6
(180.18 amu) soln
b) Ca(CH3COO)2
(158.18 amu) soln
c) NH41+
(18.05 amu) soln
d) ClO31-
(83.45 amu) soln

Homework 7.11

1. Calculate the percentage composition of the following compounds:
a) PbCl2
(Pb:74.51%; Cl:25.49%) soln
b) Ba(NO3)2
(Ba:52.546%; N:10.72%; O:36.73%) soln

2. Calculate the percentage composition of water in the compound ZnSO4 . 7 H2O
(43.86%) soln

3. Magnesium hydroxide, Mg(OH)2, is 54.87% oxygen by mass.
a) How many grams of oxygen are in 175 g of the compound?
(96.0g) soln
b) How many moles of oxygen is this?
(6.00 mol) soln

4. Calculate the percentage composition of (NH4)2CO3.
(N: 29.15%; H: 8.41%; C: 12.50%; O: 49.94%) soln

5. Calculate the percentage composition of each of the following compounds:
a) NaCl
(Na: 39.34%; Cl: 60.66%) soln
b) AgNO3
(Ag: 63.498%; N: 8.247%; O: 28.26%) soln
c) Mg(OH)2
(Mg: 41.68%; O: 58.86%; H: 3.46%) soln

Homework 7.12

1. A compound is found to contain 63.52% iron and 36.48% sulfur. Find its empirical formula.
(FeS) soln

2. Find the empirical formula of a compound found to contain 26.56% potassium, 35.41% chromium, and the remainder oxygen.
(KCrO3) soln

3. Analysis of 20.0 g of a compound containing only calcium and bromine indicates that 4.00 g of calcium are present. What is the empirical formula of the compound formed?
(CaBr2) soln

4. A compound is found to contain 36.48% Na, 25.41% S, and 38.11% O. find its empirical formula.
(Na2SO3) soln

5. Find the empirical formula of a compound that contain 53.70% iron and 46.30% sulfur.
(Fe2O3) soln

6. Analysis of a compound indicates that it contains 1.04 g K, 0.70 g Cr, and 0.86 g O. Find its empirical formula.
(K2CrO4) soln

7. Determine the empirical formula of a compound found to contain 52.11% carbon, 13.14% hydrogen, and 34.75% oxygen.
(C2H6O) soln

Homework 7.13

1. Determine the molecular formula of a compound with an empirical formula of CH and a molar mass of 78.110 g.
(C6H6) soln

2. A sample of a compound with a molar mass of 34.00 g is found to consist of 0.44 g H and 6.92 g O. Find its molecular formula.
(H2O2) soln

3. What three types of information are needed in order to find an empirical formula from percentage composition data?

4. The empirical formula of a compound is CH2O and its molar mass is 120.12g. Calculate its molecular formula.
(C4H8O4) soln

5. The empirical formula of a compound is CH2 and its molar mass is 42.08g. Calculate its molecular formula. (C3H6) soln