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WorksheetsChemical Quantities - Quiz
Total questions: 19
Worksheet time: 58mins
Name
Class
Date
1.
What is the molar mass NaCl?
a)
58 grams
b)
22.95 grams
c)
162 grams
d)
6.02 x 1023
2.
How many atoms would be contained in 454 grams of iron?
a)
6.02 x 1023 atoms
b)
8.14 atoms
c)
4.89 x 1024 atoms
d)
55.9 x 1023 atoms
3.
If you want 1.55 moles of nitrogen trichloride, how many grams should you measure out?
a)
0.0129 g
b)
120. g
c)
187 g
d)
9.33 g
4.
(0903) How many moles are in 74 g of KCl
a)
0.99 mole
b)
0.014 mole
c)
11 moles
d)
0.14 mole
5.
What is the molar mass of Ca(NO3)2?
a)
148.096 g
b)
164.086 g
c)
102.055 g
d)
70.084 g
6.
(0902) The mass of one mole of substance is called...
a)
molecular mass
b)
mole constant
c)
molar mass
d)
atomic weight
7.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
8.
What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
9.
In which compound is the percent composition by mass of Cl equal to 42%?
a)
HClO (gram formula mass = 52 g/mol)
b)
HClO2 (gram formula mass = 68 g/mol)
c)
HClO3 (gram formula mass = 84 g/mol)
d)
HClO4 (gram formula mass = 100 g/mol)
10.
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
a)
NaPO2
b)
Na2PO3
c)
Na3PO4
d)
NaPO4
11.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula
12.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula
d)
Distance Formula
13.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H6O3
14.
What is the empirical formula for the following molecular formula: C6H14
a)
C6H14
b)
C3H7
c)
CH2
d)
CH3
15.
What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?
a)
C2H5
b)
C4H10
c)
C1H2.5
d)
C4H8
16.
What is the volume of 5 moles of oxygen gas at STP?
a)
112 L
b)
22.4 L
c)
78.8 L
d)
114.24 L
17.
What is Avagadro's number?
a)
6.02 X 10 24
b)
6.02 X 10 23
c)
6.02 X 10 22
d)
6.02 X 10 21
18.
What is the volume occupied by 1 mole of any gas at STP?
a)
44.8 L
b)
22.4 L
c)
16.8 L
d)
20.4 L
19.
A mole of potassium chloride contains 6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
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