AP Chapter 1-3 Review
ALL ANSWERS AND WORK must be on your OWN paper.
1. Complete combustion of a sample of a hydrocarbon in excess oxygen gas produces half as many
moles of carbon dioxide than water. Which of the following could be the molecular formula of the
compound?
A) C2H8
B)C2H6
C) C4H8
D) C3H8
2. What remains in a reaction vessel after equal masses of K and O2 have reacted until either one
or both of the reactants have been completely consumed?
A) K2O only
B) K2O and O2
C) K and K2O
D) K2O, K and O2
3. What is the correct formula for Potassium Nitride:
A) KNO3
B) KNO2
C) K3N
D) KN
4. How many oxygen atoms are there in 0.10 mol of sulfuric acid, H2SO4?
A)
22
1.5 × 10
B) 0.4
C) 3.0 × 10
24
D) 6.6 × 10-25
5. What is the sum of all coefficients when the following equation is balanced using the smallest
possible whole numbers?
__ C6H6 + __O2 → __CO2 + __H2O
A) 17
B) 18
C) 35
D) 32
6. The relative molecular mass of a gas is 42 and its empirical formula is CH2. What is the
molecular formula of the gas?
A)
CH2
B) C2H4
C) C3H6
D) C4H8
7. What mass, in g, of hydrogen is formed when 6 mol of aluminum react with excess
hydrochloric acid according to the following equation?
2Al(s) + 6HCl (aq) → 2AlCl3 (aq) + 3H2(g)
A)
3.0
B)
4.5
C)
9.0
D)
18.0
8. Which compound has the empirical formula with the largest mass?
A. C2H6
B. C2H4
C. C2H2
D. C3H6
9. What is the number of oxygen atoms in one mole of CuSO3•3H2O?
A. 9
B. 6
C. 5.4 × 1024
Use the following reaction to answer question 10-13
Fe2O3 + 3 CO  2 Fe + 3 CO2
D. 3.6 × 1024
10. Given 1.0 moles of Iron III oxide and 3.0 moles of Carbon monoxide. Calculate the moles of Iron
produced?
11. Given 150 grams of Iron III oxide and 120 grams of Carbon monoxide calculate the grams of
Carbon Dioxide produced.
12. For the amounts given problem #11, calculate the mass in excess.
13. Assuming that the % yield of Carbon Dioxide in #11 was 62.5%, Calculate the experimental mass
of CO2 produced?
14. Calculate the number of atoms of oxygen in 7.5 grams of CO2
15. Given that a compound is made up three isotopes with an average mass of 141.15 Calculate the
% of Googolia-140
Googolia- 140 Unknown %
Googolia- 142 unknown %
Googolia- 145 5.5 %
16. How many molecules of water will you have in 35.0 grams of water?
17. Given that 1.07 grams of a compound made up of Carbon, hydrogen and Oxygen is completely
combusted in excess oxygen gas to produce 0.44 grams of CO2 and 0.63 grams of water
18. Calculate the Empirical and molecular formulas given the following information, 0.48 grams of
Carbon, 0.080 grams of Hydrogen and 0.48 grams of oxygen by mass and its molecular mass is
312 g/mol
19. Balance the following reaction and assuming that you start with 4.0 moles of Li and 8.0 moles of
CaO. Draw a picture showing the right amounts of moles when the reaction is complete.
a. Li + CaO  Li2O + Ca
20. Given the following information. Calculate the Density of X and its random error.
Mass of crucible
32.45 grams +/- 0.01
Mass of crucible and X
41.65 grams +/- 0.01
Volume of water
15.0 mL +/- 0.1
Volume of water and X
22.5 mL +/- 0.1
21. Write the formulas for the following:
a. Ammonium Sulfide
b. Sulfurous acid
c. Hydrobromic acid
d. Disulfur Hexaoxide
e. Copper II acetate
f. Lead II Sulfite
22. An element has a mass number of 58, an atomic number of 22 and a charge of +3. Calculate the
number of protons, neutrons, electrons and identify the element.