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Worksheetsmole concept
Total questions: 10
Worksheet time: 50mins
Name
Class
Date
1.
6CO2 + 6H2O --> C6H12O6 + 6O2
What is the total number of moles of CO2 needed to make 2 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
2.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
d)
32 g O2
3.
Calculate the % composition by mass of oxygen present in H2SO4.
a)
16.3%
b)
65.25%
c)
32.6%
d)
57.14%
4.
Determine the number of
atoms in
2.50 moles of zinc.
atoms in
2.50 moles of zinc.
a)
1.51 x 1024 atoms
b)
4.15 x 10-24 atoms
c)
2.71 x 10-22 atoms
d)
163 atoms
5.
A mole of carbon dioxide contains 6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
6.
How many moles are 98.3 grams of aluminum hydroxide, Al(OH)3?
a)
1.26 moles
b)
0.8 moles
c)
7,673.4 moles
d)
150 moles
7.
Convert 25 g of NaBr to molecules
a)
102.96 molecules
b)
0.24 molecules
c)
1.45x1023 molecules
d)
2.34 x 1020molecules
8.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
9.
How many conversion factors are needed to solve the problem?
How many formula units of MgO can be produced from 345 g of Mg?
2 Mg + O2 → 2 MgO
a)
1
b)
2
c)
3
d)
4
10.
XCO3 ---------- XO + CO2
The equation above shows the action of heat on the carbonate salt of metal X.
How many moles of XCO3 are needed to produced 4.0 g of oxide X?
[Relative atomic mass: C, 12; O, 16; X, 64]
a)
0.03
b)
0.05
c)
0.08
d)
0.09
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