WorksheetsMole calculations
Total questions: 18
Worksheet time: 50mins
Name
Class
Date
1.
How many particles are in 13.5 grams of Beryllium?
a)
1.5 particles
b)
9 particles
c)
4x1023 particles
d)
9x1023 particles
2.
Calculate the number of gold atoms in a 4 mole sample of gold.
a)
2.41x1024
b)
3.01x1023
c)
4.82x1024
d)
6.02x1023
3.
Calculate the mass of iron in a sample of iron ore containing 2.61x1023 iron atoms.
a)
0.433g
b)
24.2g
c)
44g
d)
6.02g
4.
Calculate the % composition by mass of oxygen present in H2SO4.
a)
16.3%
b)
65.25%
c)
32.6%
d)
57.14%
5.
Calculate the number of oxygen atoms present in 14kg of Ba(NO3)2
a)
53.578 atoms
b)
3.22x1025 atoms
c)
3.22x1022 atoms
d)
6.44x1022 atoms
6.
What is the empirical formula of a compound if the molecular formula is W18O9?
a)
W18O9
b)
W2O
c)
W6O3
d)
none of the above
7.
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
a)
C3H8
b)
CH4
c)
C2H2
d)
C4H10
8.
What is the molar mass of calcium hydroxide, Ca(OH)2?
a)
74.1 g/mole
b)
57.1 g/mole
c)
58.1 g/mole
d)
none of the above
9.
What is the total mass in grams of 0.75 mole of SO2?
a)
16 g
b)
24 g
c)
32 g
d)
48 g
10.
How many atoms of iodine are in one mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
11.
How do we get mass from moles?
a)
multiply by avogadro's number
b)
multiply by molar mass
c)
divide by avogadro's number
d)
divide by molar mass
12.
What is this number called?
a)
Avocado's Number
b)
Avogadro's Number
c)
Mendeleev's Number
d)
The mole
13.
What is the molar mass of (NH4)2CO3 ?
a)
144.0g
b)
138.0 g
c)
96.1 g
d)
78.1 g
14.
How many molecules are in 9.44 moles of AlCl3?
a)
5.68 molec AlCl3
b)
5.68x1024 molec AlCl3
c)
0.705 molec AlCl3
d)
1.25x1023 molec AlCl3
15.
What is the volume of 5.62 moles of O2?
a)
125.9 L
b)
0.25 L
c)
179.8 L
d)
0.18 L
16.
What is the volume (in liters) of 3.20 moles of H2O?
a)
71.7 L
b)
0.14 L
c)
0.17 L
d)
57.6 L
17.
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
18.
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
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