Period
Date
Name
Unit #6 MOLES Test Review
I
The Mole
A A mole is a word that represents a set number, like dozen, or pair.
B One mole of ANYTHING hasÿo0"zÿ'/'10qÿ
particles.
:-C'ÿOne mole of any pure substanÿe-hÿs a mass (in grams) equal to the sum of the
/
masses of its elements from the periodic table. This is called ÿolÿ"
II
mass.
Molar Mass - Calculate the molar mass of the foflowing. SHOW ALL WORK.
Include UNITS in your answer
-I
A Ammonium chloride[' "!ÿ/I-Iÿi/JI
(ÿ I
C MgCI2
Zÿt,3o5
CI: Zv_ 3 s. %3
Cl 35, ffs3
B Ca3(PO4)2
P" 2 ÿ ÿv" 9"7ÿ4
D Sodium nitrate /ÿ'ÿ1 A/%
IV: I '-I ,oo7
O: 3,L t ÿ;,flf
gff .eeq j
I'rI
Conversions - SHOW ALL WORK. Include UNITS in your answer.
C3 Hÿ,
A How many molecules are in 0.42 moles of tricarbon octahydride?
2.5ÿ10
3
Find the key online at www.cincochem.pbworks.com
-I
B How many moles are in 804 g of Na3P04?
/ : ÿ o.97V
O:y¢ ly. 19f
I & 5.9qo9
coppek_ÿ (o 9,
ÿ q Jÿ /ÿ (
C HOW many at,ÿS are in 64.82 g of
,.tÿz4 ÿ
lqlÿ leÿ3
c/
J
/
D How many grams are in 5.78 moles of potassium oxide?
0 : Iÿ.ÿ
E
How many moles are in 1.217 x 1028 atoms of sulfur?
2
F How many ÿ are in 1.84 x 1020 molecules of NO?
N, I H .o°'7
3 o ,0o ÿD (ÿ(
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m
IV
Representative Particles
A Match the substance with the name of its representative particle
1.
C
A
2.
3.
Element
a.
Ionic compound
Covalent compound
b.
c.
molecule
atom
formula unit
B List the 7 diatomic elements
V
Percent Composition - SHOW ALL WORK.
A
Find the percent composition for all elements in Fe203,
, ZÿS.gqrÿ ÿ ÿ\ \,ÿ,ÿ ÿ ÿ5ÿ.ÿ7 ÿ ioo
1 9ÿ,ÿ,ÿ7ÿ/ÿ
Answer: % Fe =ÿ'ÿ(ÿ %0=3D'Dÿ
B Find the percent composition for all elements in Ba(OH)2
Answer: % Ba =ÿ0 .ÿ5 % 0=Iÿ,ÿ % H= I.IZ
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VI
Empirical and Molecular Formula
A
Match the compounds that have the same empirical formula.
1. C4H804
a. C4H608
__ÿ2. CH03
b. C2H402
_ÿ3. C2H304
c. C2H206
4. CsHgOÿI
_.ÿ
5. C4H602
d. C2H30ÿ
e. CloH18022
SHOW ALL WORK.
B
What is the empirical formula for a compound containing 17.6ÿNa, 39.7°//Cr, and
2ffo:
Iÿ1. ÿ ÿLÿ. ÿ17,ÿ. ÿoÿ
0,1 ÿ,(oÿ1 Nÿ
D.1GV
Iÿ I : O,ltÿl,ÿ G.ÿ
'ÿ--ÿ ÿ7ÿ//-ÿ'ÿ
51.ÿ t,9 a
!
C
--
What is the empirical formula of a compound that contains 5.90 g hydrogen and
94.1 g oxygen?
i,
What is the molecular formula of the above compound if its molar mass is
204.00 g?
O: I 5-.qÿ ÿ
\ÿ,,oOÿ
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