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WorksheetsMolar mass and % composition quiz 1
Total questions: 20
Worksheet time: 56mins
Name
Class
Date
1.
Which of the following statements is NOT true?
a)
Molar mass is molecular mass
b)
Molar mass is the sum of the number of all atoms in one molecule
c)
Molar mass is the sum of the weight of all the atoms in the molecule
d)
You don't need atomic numbers when calculate molar mass
2.
What is the molar mass of CO2?
a)
12
b)
16
c)
32
d)
44
3.
What is the molar mass of sodium?
a)
11
b)
23
c)
45.98
d)
3
4.
The molar mass of an element is equal to its...
a)
Atomic mass
b)
Atomic number
c)
Oxidation number
d)
Valence electrons
5.
Find the percentage composition of Mg in Mg3(PO4)2.
a)
27.48% Mg
b)
43.11% Mg
c)
16.00% Mg
d)
12.63% Mg
6.
Find the molar mass of KCl
a)
36 g/mol
b)
78 g/mol
c)
74 g/mol
d)
178 g/mol
7.
What is the molar mass of fluorine gas, F2?
a)
18.998 g/mol
b)
38 g/mol
c)
9 g/mol
d)
18 g/mol
8.
Gary read 34 pages of a 340-page book. What percent did he read?
a)
34%
b)
15%
c)
10%
d)
25%
9.
What is the mass percentage of Carbon in Carbon dioxide?
a)
27.27%
b)
42.86%
c)
72.73%
d)
72.72%
10.
Which list of number of atoms in MgF2 is right?
a)
Mg : 1-- F : 1
b)
Mg : 1 -- F : 2
c)
Mg : 2 -- F : 1
d)
Mg : 0 -- F : 1
11.
Which list of number of atoms in Mg(NO3)2 is right?
a)
Mg : 1--NO : 6
b)
Mg : 1-- N : 6--O: 6
c)
Mg : 1-- N: 1-- O: 5
d)
Mg : 1-- N: 2-- O: 6
12.
Which list of number of atoms in K3PO4 is right?
a)
K : 3--PO : 4
b)
K :3--P : 1--O: 4
c)
K : 3-- P: 4--O: 4
d)
K : 3-- P: 5--O: 4
13.
How to calculate molar mass of H2O?
a)
2+16=18
b)
1+16=17
c)
2+32=34
d)
1+31=32
14.
The chemical formula of potassium iodide is
a)
KI
b)
PI
c)
KI₂
d)
K₂I
15.
The chemical formula of magnesium phosphide is
a)
MgP
b)
Mg₂P₃
c)
Mg₃P₂
d)
Mg₃(PO₄)₂
16.
The chemical formula of magnesium hydroxide is
a)
MgOH₂
b)
Mg(OH)₂
c)
Mg(OH)
d)
MgH₂
17.
The chemical formula of sodium sulfate is
a)
S₂SO₄
b)
NaSO₂
c)
NaSO₄
d)
Na₂SO₄
18.
The chemical formula of ammonium carbonate is
a)
NH₃CO₃
b)
NHCO
c)
NH₄CO₃
d)
(NH₄)₂CO₃
19.
The chemical formula of dinitrogen textroxide is
a)
Ni₂O₄
b)
NiO
c)
N₂O₄
d)
NiO₂
20.
The chemical formula of tetraphosphorus decaoxide is
a)
F₄O₁₀
b)
P₄O₁₀
c)
PO
d)
P₁₀O₄
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