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WorksheetsPercent Composition and Mole Calculation
Total questions: 25
Worksheet time: 25mins
The percentage by mass of each element in a compound
dimensional analysis
percent composition
percent yield
limiting reactant
What is the percent composition by mass of sulfur (S) in the compound MgSO4?
20.22%
19.85%
26.64%
28.64%
Calculate the number of atoms in 0.0340 g Zn.
5.200 x 10-4 atoms Zn
3.130 x 1023 atoms Zn
3.130 x 1020 atoms Zn
1 atom Zn
Determine the mass of 4.20 moles of C6H12
354 g
84 g
337 g
421 g
How would you calculate the percentage of Hydrogen?
2
16
18
100
(Page 38-40) Complete the formula for % Composition.
mass of element
total mass of compound
100
What is the percent composition of chlorine in sodium chloride (NaCl)? (Atomic masses: Na = 22.99 g/mol, Cl = 35.45 g/mol)
60.66%
39.34%
50.50%
49.50%
Calculate the percent composition of hydrogen in methane (CH 4 ). (Atomic masses: C = 12.01 g/mol, H = 1.01 g/mol)
25.13%
74.87%
20.11%
79.89%
Calculate the percent composition of oxygen in water (H 2 O). (Atomic masses: H = 1.01 g/mol, O = 16.00 g/mol)
88.81%
11.19%
89.11%
10.89%
Find the percent composition of Aspirin C9H8O4?
C
60%
H
4.4%
O
35.6%
Molar Mass of Aspirin
180 g/mol
Molar Mass of C9
108 g/mol
The percent, by weight, of carbon in C₄H₈O₃ is (a) .
55%
72%
31%
46%
Complete the formula for % Composition.
mass of element
total mass of compound
100
Which element in the compound will have the HIGHEST percent composition?
(Page 38-40) Percent Composition is the (a) by (b) of each element in a compound.
percentage
mass
compound
A student calculated the number of moles of methane (CH4) present in a 100g sample of a gaseous mixture. If the student determined that there’s 0.6 moles of methane present in the sample, what is the percent composition of methane in the sample?
.096%
9.6%
.9%
90%
What is the percent composition by mass of carbon in carbon dioxide (CO_2)? (Atomic masses: C = 12.01 g/mol, O = 16.00 g/mol)
27.29%
72.71%
44.01%
12.01%
Calculate the number of moles in 88 grams of carbon dioxide (CO_2). (Molar mass of CO_2 = 44.01 g/mol)
2 moles
1 mole
0.5 moles
4 moles
What is the percent composition of hydrogen in water (H_2O)? (Atomic masses: H = 1.01 g/mol, O = 16.00 g/mol)
11.19%
88.81%
5.59%
94.41%
Determine the mass of 2.5 moles of sulfuric acid (H_2SO_4). (Molar mass of H_2SO_4 = 98.08 g/mol)
245.2 g
196.16 g
98.08 g
392.32 g
What is the percent composition of nitrogen in ammonium nitrate (NH_4NO_3)? (Atomic masses: N = 14.01 g/mol, H = 1.01 g/mol, O = 16.00 g/mol)
35.00%
28.00%
17.50%
22.22%
Calculate the percent composition of oxygen in glucose (C_6H_12O_6). (Atomic masses: C = 12.01 g/mol, H = 1.01 g/mol, O = 16.00 g/mol)
53.29%
42.11%
48.38%
50.00%
What is the percent composition of calcium in calcium carbonate (CaCO_3)? (Atomic masses: Ca = 40.08 g/mol, C = 12.01 g/mol, O = 16.00 g/mol)
40.04%
48.08%
30.08%
50.04%
Determine the number of moles in 180 grams of glucose (C_6H_12O_6). (Molar mass of C_6H_12O_6 = 180.18 g/mol)
1 mole
2 moles
0.5 moles
3 moles
What is the percent composition of iron in iron(III) oxide (Fe_2O_3)? (Atomic masses: Fe = 55.85 g/mol, O = 16.00 g/mol)
69.94%
30.06%
55.85%
44.15%
Calculate the percent composition of chlorine in potassium chloride (KCl). (Atomic masses: K = 39.10 g/mol, Cl = 35.45 g/mol)
47.55%
52.45%
35.45%
39.10%
