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WorksheetsMoles and Mass
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
How many moles of lead in 42g of Na (M=23)?
a)
42/23
b)
23/42
c)
42 x 6 x 1023
2.
What is the mass of 1.2 x 1024 atoms of S (M =32)?
a)
1.2 x.1024 x 32
b)
1.2 x 1024 / 6 x 1023
c)
2 x 32
3.
How many atoms of Cl in 35.5g of Cl2 molecules (M(Cl) = 35.5)
a)
35.5/35.5 x 6 x 1023
b)
71 x 6 x 1023
c)
71/35.5 x 6 x 1023
4.
How many moles of CO molecules in 56g of CO (M(C) = 12, M(O) =16 ?
a)
2
b)
28/56
c)
56 x 6 x 1023
5.
How many moles of H in 32g of methane (CH4). M(CH4) = 16
a)
32/16
b)
32 x 16
c)
32 /16 x 4
d)
32/16 x 4
6.
What is the mass of O in 100g of CaCO3 (M (CaCO3 = 100)
a)
1
b)
100/48
c)
100/16
d)
3
7.
What is the mass of 1.2 x 1025 atoms of sulfur (M(S) =32) ?
a)
1.2.x.1025 / 6 x 1023 x 32
b)
1.2 x 1025 x 32
c)
2 x 32
8.
How many atoms of H in 4.5g of H2O? M(H2O) =18 ?
a)
4.5 / 18
b)
18/4.5 x 6 x 1023
c)
0.25 x 6 x 1023
9.
In 53g of Na2CO3 (M(Na2CO3) = 106, M(O) =16), what is the mass of O?
a)
53 /106
b)
53/106 x 16
c)
53 /106 x 3 x 16
10.
How many molecules of of methane are there if there are 24 x 1023 atoms of H? (MCH4 = 16)
a)
4
b)
1
c)
24 x 1023 / 16
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