Chemistry 100
Chapters 5-6 review
1. Find the charge of each element for these ionic compounds:
a) AlCl3
d) BaI2
b) BeO
e) CaS
c) Na2O
f) Ga2O3
2. Name each ion:
a) NO3b) OHc) HCO3d) NH4+
e) Cu2+
f) MnO4g) Fe3+
h) S2-
3. Find the name of the following compounds:
a) Na2SO4
e) SO3
b) Se2F2
f) HBr
c) SnHPO4
g) H2SO3
d) Be(OH)2
h) LiNO2
4. Write the formula for the following compounds:
a) Ammonium Phosphate
d) Perchloric acid
b) Phosphorus trichloride
e) Magnesium sulfide
c) Aluminium nitrite
f) Hydrochloric acid
5. Which formulas are not correct? Correct them if they are not correct:
a) Al2O3
e) LiCO3
b) MgOH
f) AlSO4
c) Be2Cl
g) Ca2NO2
Dr. Behrang Madani
Chemistry 101
CSUB
d) Na2O4
h) NH4PO3
6. Use the following ions to write the chemical formula for each ionic compound:
a) Al3+
Cl-
b) Ba2+
S2-
c) Li+
Br-
d) Ga3+
O2-
7. Calculate the percent by mass of each element in the following compounds:
a) Al2O3
b) HNO3
8. Calculate the number of moles of indicated substance in each of the following samples:
a) 34.6 g of C6H12O6
b) 11.6 g of FeCl3
9. Calculate the mass in grams of each of the following samples:
a) 3.52 moles of copper(II) sulfate
b) 1.71 moles of sodium carbonate
Dr. Behrang Madani
Chemistry 101
CSUB
10. A compound was analyzed and was found to have the following percent composition by
mass: manganese, 36.38%; sulfur, 21.24%; oxygen, 42.38%. Calculate the empirical formula
for this compound:
11. Calculate the number of atoms present in each of the following samples:
a) 5.64 g of C3H8
b) 9.34 g of H3PO4
12. Calculate the number of molecules present in each of the following samples:
a) 12.3 g of CaCl2
b) 31.3 g of Mg(OH)2
13. In problem 10, find the molecular formula if the molar mass is 151 g.
14. How many moles of (NH4)2SO4 are in a sample which weight 545g?
Dr. Behrang Madani
Chemistry 101
CSUB
15. How many molecules are in 326g of C2H5OH?
16. Calculate the formula weight of these compounds:
a) C12H22O11
b) Pb(OH)2
c) Al(NO3)3
17. What is the mass in gram of 500 molecules of Na2SO3?
18. Lime, CaO, is produced by reaction CaCO3(s) → CaO(s) + CO2(g). What weight of CaO
is obtained by the decomposition of 38.7g of CaCO3?
19. For the reaction 2HgO(s) → 2Hg(l) + O2(g) how many molecules of Hg are produced by
using 367g HgO?
20. Given the reaction 2KClO3(s) → 2KCl(s) + 3O2(g). What volume of O2 will be obtained
by decomposition of 95g KClO3 (at STP)?
Dr. Behrang Madani
Chemistry 101
CSUB