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WorksheetsMoles Test Review
Total questions: 13
Worksheet time: 22mins
A formula that shows the smallest whole number ratio of elements in a compound (the chemical formula that is reduced)
percent composition
empirical formula
molecular formula
molar mass
The mass in grams of one mole of any pure substance
mole
percent composition
molecular formula
molar mass
Which of the following is NOT equal to one mole?
6.02 x 1023 water molecules
10.81g of Boron
8g of Oxygen
22.4 L of neon gas at STP
Find the molar mass of Al2(SO4)3
278.03 g/mol
342.14 g/mol
134.03 g/mol
262.17 g/mol
How many grams are in a 3.70 mol sample of iron?
207 g
207 mol
0.0662 g
0.0662 mol
Determine the number of moles in 1.2 x 1024 molecules of CO2.
2.0 x 1046 molecules
2.0 x 1046 mol
2.0 molecules
2.0 mol
How many moles of air is in a ball holding 5.54 L of air?
0.247 L
0.247 mol
124 L
124 mol
Determine the number of heilum atoms in birthday balloon holding 14.2 L of air at STP.
3.82 x 1023 atoms
1.91 x 1026 atoms
1.05 x 10-24 atoms
5.28 x 10-22 atoms
How many grams of water can be found in a 3.40 x 1024 molecule sample?
0.313 g
1.02 x 1048 g
102 g
1.14 x 1047 g
Find the percent composition of each element in Mg(OH)2
Mg = 42%, O = 27%, H = 2%
Mg = 2%, O = 2%, H = 29%
Mg = 59%, O = 39%, H = 2%
Mg = 42%, O = 55%, H = 3%
Find the empirical formula with the composition as 15.8% carbon and 84.2% sulfur.
CS2
C2S
C4S8
CS5
Using the empirical formula, CH2, find the molecular formula if the actual mass is 56 g/mol.
CH2
C2H4
C4H8
C8H16
A compounds molar mass is 240.28 g/mol. Its percentage composition is 75.0% carbon, 5.05% hydrogen and 20.0% oxygen. What is the compound’s molecular formula?
C5H4O
C24H20O5
C15HO4
C15H12O3
