WorksheetsThe Mole and Formulas
Total questions: 19
Worksheet time: 5hrs 45mins
Name
Class
Date
1.
How many grams are in 1.2 x 1024 molecules of CO?
a)
28 grams
b)
56 grams
c)
6.02 grams
d)
1.2 grams
2.
How many steps are in a gram to mole conversion?
a)
1
b)
2
c)
3
d)
4
3.
How many moles are in 3.01 x 1022 atoms of magnesium?
a)
0.05 moles
b)
1.81 x 1046 moles
c)
5.00 x 1021 moles
d)
5 moles
4.
What is the molar mass of table salt (NaCl)?
a)
116 g/mol
b)
35.5 g/mol
c)
22 g/mol
d)
58.5 g/mol
5.
What is the mass of 0.89 mol of CaCl2?
a)
111 grams
b)
0.008 grams
c)
98.9 grams
d)
none of the choices
6.
How many steps are in a gram to molecule conversion?
a)
1
b)
2
c)
3
d)
4
7.
Avogadro’s number is:
a)
6.02 x 1022
b)
6
c)
6.02 x 1023
d)
3.01 x 1023
8.
(0901) Determine the number of moles in 5.2 x 1022 atoms of gold.
a)
0.086 mole
b)
0.52 mole
c)
8.63 x 1044 moles
d)
3.1 x 1046 moles
9.
What is the equation for calculating percent composition?
a)
mass of element/mass of compound = x 100
b)
mass of compound/mass of element = x 100
c)
total mass/molar mass = x 100
d)
molar mass/molar mass = x 100
10.
What is the percent composition by mass of magnesium in the compound MgSO4
a)
20%
b)
27%
c)
46%
d)
53%
11.
What is the empirical formula for the following molecular formula: C6H14
a)
C6H14
b)
C3H7
c)
CH2
d)
CH3
12.
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
13.
What is the percent composition of Ca in CaCl2 ?
a)
36.6%
b)
63.4%
c)
52%
d)
48%
14.
What is the molecular formula for a compound with a molar mass of 68g/mol and an empirical formula of H2O2 ?
a)
H4O4
b)
HO
c)
H2O4
d)
H4O2
15.
What is the molar mass of H2O?
a)
6.02 x 1023
b)
16 grams
c)
18 grams
d)
15.99999 grams
16.
Calculate the mass of 2.4 x 1024 atoms of carbon.
a)
3.4
b)
4
c)
12
d)
48
17.
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
18.
What is the percent composition of a compound that contains 40.8 g carbon and 54.4 g oxygen?
a)
42.9 % carbon; 57.1% oxygen
b)
57.1 % carbon; 42.9 % oxygen
c)
40.8 % carbon; 54.4 % oxygen
d)
54.4 % carbon; 40.8% oxygen
19.
How many grams are in 1.2 x 1024 atoms of C?
a)
28 grams
b)
24 grams
c)
6.02 grams
d)
1.2 grams
100 %
