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WorksheetsMoles Unit Review
Total questions: 20
Worksheet time: 34mins
How many O's are in Ba3(PO4)2
4
8
6
3
1 mole of Li
1 mole of Au
1 mole of Si
None, all are equal
The number of atoms of one mole of an element is equal to
Avogadro’s number
1 gram
Aufbau’s number
1 molecule
The number 6.02 x 1023 is called (a)
What is the measured amount of a product obtained from a chemical reaction?
Actual Yield
Theoretical Yield
Mole Ratio
Percent Yield
96 g
130 g
232.5 g
303.3 g
Reorder the following in the order of steps on calculating molar mass
Count the # of atoms of each element
Use the periodic table to determine the mass of each element
Multiply the number of atoms of each element by their mass
add all of the different amounts
Where do you find the numbers used for mole ratios?
total mass of products
Balanced Chemical equation
periodic table
molar masses
atom
molecule
mole
gram
In the diagrams, circles of different sizes represent atoms of different elements. Which diagram can represent hydrogen chloride gas (HCl)?
How many moles of carbon dioxide are produced when 10.4 mol of propane gas (C3H8) is burned?
C3H8 + 5O2 --> 3CO2 + 4H2O
31.2
52
3.46
5
What will the percent yield of a reaction be if the theoretical yield is 40.5 g Cu and experimentally a yield of 38.7 g Cu was measured?
82%
105%
87%
95.6%
10. How many moles are in 89 grams of copper (II) hydroxide, Cu(OH)2?
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
6
2
3
1
What is the name for the calculated amount of a product that should be produced in a chemical reaction?
expected yield
theoretical yield
actual yield
true yield
When two substances react to form products, what is the reactant that is used up first called?
explosive reactant
true reactant
limited reactant
excess reactant
What is conserved in every chemical reaction?
mass and molecules
mass and liters
mass and atoms
mass and moles
2CO + O2 --> 2CO2
According to the equation above and the picture to the left, what will the final product box show?
P4+O2 --> P2O3
3 P4+ O2 --> 2 P2O3
P4+ O2 --> 2 P2O3
P4+ 3 O2 --> 2 P2O3
P4+ 2 O2 --> 3 P2O3
When looking at a chemical equation, what tells you the mole ratios?
the subscripts (small numbers at the bottom)
the element symbols
the coefficients
15.0
