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WorksheetsMolar Mass-%Composition
Total questions: 15
Worksheet time: 4hrs 45mins
Name
Class
Date
1.
What is the molar mass of CO2?
a)
12 g/mol
b)
16 g/mol
c)
32 g/mol
d)
44 g/mol
2.
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
3.
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
4.
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
5.
What is the molar mass of B2(CO3)3?
a)
81.632 g/mol
b)
94.842 g/mol
c)
38.822 g/mol
d)
201.648 g/mol
6.
Find the molar mass of KCl
a)
36 g/mol
b)
78 g/mol
c)
74 g/mol
d)
178 g/mol
7.
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
8.
Molar mass is in units of ________.
a)
grams
b)
grams/mole
c)
mole
d)
moles/gram
9.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
10.
The mass of one mole of substance is called...
a)
molecular mass
b)
mole constant
c)
molar mass
d)
atomic weight
11.
Which compound has the smallest molar mass?
a)
CO
b)
CO2
c)
H2O
d)
H2O2
12.
What is percent composition?
a)
The mass percentage of each element within a compound
b)
The mole percentage of each element within a compound
c)
The relative abundance of each isotope within an element
13.
What is the percent composition of C6H12O6?
a)
CH2O
b)
C 39.99% H 6.73% O 53.28%
c)
C 25% H 50% O 25%
d)
C 56.25% H 8.99% O 34.76%
14.
What is the molar mass of (NH4)2CO3?
a)
144g
b)
138g
c)
96g
d)
78g
15.
What is the percent composition of barium in BaCrO4?
a)
20.5%
b)
54.2%
c)
25.26%
d)
66.88%
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