1.
A 5.05 g sample of quartz (SiO2
) contains 2.36 g of silicon. What are
the percentages of silicon and oxygen in quartz?
2.
How many formula units are in 0.25 mole of Na
2
0?
3.
Calculate the molar mass of CuSO
4
•5H
2
0
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4.
If 8.53 x 10
24
molecules of a substance have a mass of 483 g, what
is the molar mass
of the substance?
5.
How many oxygen atoms are in 75.0 g of SO
3
?
6.
What is the mass of 2.4 x 10
23
molecules of NO
2
?
7.
Given the following molecular formulas, determine the
empirical formula of each
compound:
N
2
0
5
,
PC1
3
,
H
2
0
2
,
C
6
H
4
Cl
2
8.
Acetic acid is the active ingredient in vinegar.
It
consists of
40.00% C, 6.714% H, and
53.29% 0. What is the empirical
formula of acetic acid?
9.
Butyric acid has a very unpleasant odor.
It
is present in some rotting
foods, body odor and vomit. Butyric acid has a molar mass of 88.10
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g/mol and consists of 54.53% C,
9.153% H, and 36.32% 0. What is
the molecular formula of butyric acid?
10.
Calculate the molarity of a solution consisting of 75.0 g of
KOH in 2.00 L of
solution.
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- Fall '14
- HaroldH.Trimm
- Chemistry, Mole
-
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