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WorksheetsChemistry U-1 Review 5th
Total questions: 20
Worksheet time: 56mins
Name
Class
Date
1.
What is the molar mass of potassium?
a)
39.10
b)
30.97
c)
19
d)
15
2.
How many grams are in 1.3 moles of carbon dioxide, CO2?
a)
0.03
b)
57.21
c)
44.01
d)
1.3
3.
How many moles are in 150 g of magnesium hydroxide, Mg(OH)2?
a)
58.33
b)
8,749.5
c)
2.57
d)
6.02 x 1023
4.
What is the molar mass of Fe?
a)
26 g/mole
b)
55.85 g/mole
c)
56 g/mole
d)
6.02 x 1023 g/mole
5.
What is the molar mass of Ca(NO3)2?
a)
164.03 g/mole
b)
228.32 g/mole
c)
150.02 g/mole
d)
218.05 g/mole
6.
How many grams are in 1.5 moles of O?
a)
9.03 x 1023 grams
b)
16 grams
c)
24 grams
d)
6.02 x 1023 grams
7.
What are the coefficients needed to balance the equation?
___ C2H6 + ___ O2 ------ ___CO2 + ___ H2O
___ C2H6 + ___ O2 ------ ___CO2 + ___ H2O
a)
1,5,2,3
b)
1,2,2,3
c)
2,7,4,6
d)
2,6,4,6
8.
The molar mass of an element is equal to its...
a)
Atomic mass
b)
Atomic number
c)
Oxidation number
d)
Valence electrons
9.
Fluorine gas is diatomic. What is its molar mass?
a)
18.998 g/mol
b)
37.996 g/mol
c)
9 g/mol
d)
18 g/mol
10.
Which compound has the smallest molar mass?
a)
CO
b)
CO2
c)
H2O
d)
H2O2
11.
The chemical formula of magnesium phosphide is
a)
MgP
b)
Mg₂P₃
c)
Mg₃P₂
d)
Mg₃(PO₄)₂
12.
The chemical formula of dinitrogen textroxide is
a)
Ni₂O₄
b)
NiO
c)
N₂O₄
d)
NiO₂
13.
What is the percentage of chromium in potassium dichromate?
a)
38.1%
b)
27.2%
c)
34.7%
d)
100%
14.
Find the percentage composition of Mg in Mg3(PO4)2.
a)
27.75% Mg
b)
23.57% Mg
c)
48.68% Mg
d)
13.45% Mg
15.
Find the Molar Mass of:
Ga2(SO3)3
Ga2(SO3)3
a)
280 g/mol
b)
400 g/mol
c)
380 g/mol
d)
480 g/mol
16.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
17.
What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
18.
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
a)
C3H8
b)
CH4
c)
C2H2
d)
C4H10
19.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
20.
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)
a)
SO
b)
SO2
c)
SO3
d)
SO4
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