5 Steps to a 5 AP Chemistry

AP Chemistry Practice Exam 2  329

16.Silver oxide, Ag 2 O, can be decomposed to silver
metal, Ag, plus oxygen gas, O 2. How many moles
of oxygen gas will form when 4.64 g of solid
silver oxide is decomposed? The formula mass of
silver oxide is 232.

(A) 0.100 mol

(B) 0.0100 mol

(C) 0.0200 mol

(D) 0.0150 mol

(E) 0.0250 mol

17. C 4 H 11 N(l) + O 2 (g) →____ CO 2 (g)

• H 2 O(l)+ N 2 (g)

When the above equation is balanced, the lowest

whole-number coefficient for N 2 is:

(A) 2

(B) 22

(C) 16

(D) 27

(E) 4

18.2 KMnO 4 +5 H 2 C 2 O 4 +3 H 2 SO 4 →K 2 SO 4 +
2 MnSO 4 +10 CO 2 +8 H 2 O

How many moles of MnSO 4 are produced when

2.0 mol of KMnO 4 , 10 mol of H 2 C 2 O 4 , and

6.0 mol of H 2 SO 4 are mixed?

(A) 1.0 mol

(B) 2.0 mol

(C) 3.5 mol

(D) 2.5 mol

(E) 3.0 mol

19.When the following equation is balanced, it is
found that 2.00 mol of C 8 H 18 reacts with how
many moles of O 2?

____ C 8 H 18 + ____ O 2 → ____ CO 2 + ____ H 2 O

(A) 37.5 mol

(B) 2.00 mol

(C) 25.0 mol

(D) 1.00 mol

(E) 12.5 mol

20.Ra +2 H 2 O →Ra(OH) 2 +H 2

Radium reacts with water according to the above

reaction. What volume of hydrogen gas, at stan-

dard temperature and pressure, is produced from

0.0100 mol of radium?

(A) 0.560 L

(B) 0.224 L

(C) 0.448 L

(D) 0.112 L

(E) 0.336 L

21.Three flexible containers are used for gases. The

containers are at the same temperature and pres-

sure. One container has 2.0 g of hydrogen,

another has 32.0 g of oxygen and the third has

44.0 g of carbon dioxide. Pick the false statement

from the following list:

(A) The densities increase in the order hydrogen

<oxygen <carbon dioxide.

(B) The number of molecules in all the contain-

ers is the same.

(C) The average kinetic energy of all the mole-

cules is the same.

(D) The volume of all three containers is the

same.

(E) The average speed of all the molecules is the

same.

22.If a sample of SO 2 effuses at a rate of 0.0035 mol

per hour at 20°C, which of the gases below will

effuse at approximately double the rate under the

same conditions?

(A) H 2

(B) O 2

(C) CO

(D) He

(E) CH 4

Choose from the following types of energy for

questions 23–26.

(A) free energy

(B) lattice energy

(C) kinetic energy

(D) activation energy

(E) ionization energy

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