54.An excess of S 8 (s) is heated with a
metallic element until the metal reacts
completely. All excess sulfur is
combusted to a gaseous compound and
escapes from the crucible. Given the
information that follows, determine the
most probable formula for the residue.

mass of crucible, lid, and metal =

55.00 grams

mass of crucible and lid = 41.00 grams

mass of crucible, lid, and residue =

62.00 grams

A. CuS

B. Cu 2 S

C. FeS

D. Fe 2 S 3

E. Not enough information is given to

solve the problem.

55.When 3.00 grams of a certain metal are
completely oxidized, 3.80 grams of its
oxide are produced. The specific heat of

the metal is 0.052 cal/g ⋅°C. What is

the approximate atomic weight of this

metal?

A. 35 g/mole

B. 65 g/mole

C. 124 g/mole

D. 150 g/mole

E. 180 g/mole

56. The density of a gas is directly
    proportional to its

A. pressure

B. volume

C. kinetic energy

D. temperature

E. molecular mass

57. The valence electron configuration of
    element A is 3s^23 p^1 and that of B is
    3 s^23 p^4. What is the probable empirical
    formula for a compound of the two
    elements?

A. A 2 B

B. AB 2

C. A 3 B 2

D. A 2 B 3

E. AB

58. Which formula correctly represents the
    diamminediaquadibromochromium(III)
    ion?

A. Cr H O 2322 NH Br 2

+

8 ^^hhB

B. NH 2 H O Br Cr 2

3

32

+

8 ^^hhB

C. Cr H O NH Br

3

2 2 3 2 2

+

8 ^^hhB

D. NH 322 H O Br 2 2 +Cr

+

8 ^^hh B

E. Cr H O NH Br

2

2 2 32

+

8 ^^hhB

Practice Test

Section

I

Multiple-Choice Questions

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