WorksheetsAvogadro's Number and Moles
Total questions: 10
Worksheet time: 43mins
Name
Class
Date
1.
How many atoms are in 9.44 moles of Al?
a)
5.68 atomsAl
b)
5.68x1024 atoms Al
c)
0.705 atoms Al
d)
1.25x1023 atoms Al
2.
How many moles are 2.85 x 1018 atoms of iron?
a)
4.73 x 10-6 moles
b)
1.72 x 1042 moles
c)
1.72 x 10-42 moles
d)
4.73 x 106 moles
3.
How many grams are in 3.3 x1023 atoms of N2I3
a)
126g
b)
224g
c)
789g
d)
433g
4.
Calculate the number of moles in 20.9 grams of N2
a)
1.49 moles
b)
0.746 moles
c)
0.37 moles
d)
1.74 moles
5.
How many moles of magnesium are in 3.01x1022 atoms of magnesium?
a)
5.00x1044 moles Mg
b)
0.050 moles Mg
c)
1.81x1046 moles Mg
d)
5 moles Mg
6.
How many atoms of carbon are in 6.00g of carbon?
a)
1.20x1024atoms C
b)
6.02x1023atoms C
c)
3.01x1023atoms C
d)
1.50x1023atoms C
7.
Which represents the greatest number of atoms?
a)
50.0 g Cs
b)
50.0 g Co
c)
50.0 g Ca
d)
50.0 g Cu
8.
What has the most mass?
1 trillion atoms (1.0x1018) of zinc
1 trillion atoms of iron or
1 trillion atoms of aluminum
(Hint use Avogadro's Number 6.023x1023 to determine the number of moles). Grams = MW x Moles)
a)
zinc
b)
iron
c)
aluminium
9.
Which is the smallest number show below?
a)
1x10-3
b)
0.001
c)
0.0003
d)
1x10-6
10.
1 mole of zinc is how many atoms?
a)
65.4
b)
6.02x1023
c)
6.54x1023
d)
0.000,000,000,000,000,000,000,654
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