1.
Which of the following can hydrogen bond with water but not with itself?
X.
HF
Y.
NH
3
Z.
H
3
COCH
3
A.
X only
E.
X and Z
B.
Y only
F.
Y and Z
C.
Z only
G.
X, Y, and Z
D.
X and Y
H.
none of them
2.
Perform the indicated operations and identify the answer with the correct number of
significant figures:
(33.6567 – 33.575) / (56.1443)(3.6677 x 10
–2
).
A.
0.04
E.
0.03970
B.
0.040
F.
0.03968
C.
0.0400
G.
0.039680
D.
0.0397
H.
0.039676
3.
Which of the following is the empirical formula of a compound that is 76.57% C
and 6.43% H by mass?
4.
The element antimony has an atomic mass of 121.757 amu and only two naturally
occurring isotopes.
One isotope has an abundance of 57.300% and has an isotopic
mass of 120.904 amu.
Based on this data, what is the mass of the other isotope?
5.
Consider two elements X and Y.
The compound XY
2
has equal masses of X and Y.
The ratio of the mass of Y to the mass of X in the compound X
2
Y
5
is
6.
The number of atoms
in 1.000 mol of aluminum sulfate is
A.
6.022 x 10
23
F.
4.818 x 10
24
B.
1.204 x 10
24
G.
6.624 x 10
24
C.
3.011 x 10
24
H.
7.829 x 10
24
D.
3.613 x 10
24
I.
8.431 x 10
24
E.
1.807 x 10
24
J.
1.024 x 10
25
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7.
An aqueous solution that is 65.0 % H
2
SO
4
by mass has a density of 1.55 g/mL.
What volume of this solution contains 2.00 moles of H
2
SO
4
?
8.
Magnesium nitride can be formed by the reaction of magnesium metal with
nitrogen gas.
Which of the following statements is true when 35.00 g of
magnesium and 15.00 g of nitrogen gas are mixed and the reaction is allowed to
proceed to completion?
W.
50.00 grams of magnesium nitride are formed.
X.
1.55 grams of N
2
(g) are left over.
Y.
13.45 grams of N
2
(g) are left over.
Z.
Magnesium is in excess.
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 Fall '07
 Zbaida
 Hydrogen Bond, Enthalpy, Ionization Energy, Energy, e. f. g., E. F. G. H.

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