CHEMISTRY 110L STOICHIOMETRY WORKSHEET
Palomar College
NAME:___________________________________________________________________________________ DATE:_____________________
MASS – MOLES – ATOMS/MOLECULES
1. Fill in the table. Show your work below.
Substance
Mass
Silicon
0.456 lb
Boron
Manganese
Aluminum
Carbon
0.0628 kg
g
lb
Substance
Mass
Ammonium Carbonate
5.92 g
Sodium Phosphate
Acetic Acid
Diphosphorus
Heptoxide
Copper(II) Nitrite
g
μg
Chlorine
Sulfuric Acid
Moles
8.2 mol
5.87 mol
Moles
g
μg
0.0628 kg
g
lb
0.987 mol
1.46 mol
Atoms
3.97 × 1025
4.92 × 1022
Molecules
2.58 × 1023
7.55 × 1021
AMMONIUM CARBONATE
1. What is the molar mass of ammonium carbonate?
2. What is the mass percent of each element?
3. How many moles of O are in 9.85 g of ammonium carbonate?
4. How many H atoms are in 0.546 lb of ammonium carbonate?
5. How many grams of N are in a mass of ammonium carbonate that contains 1.23 × 1023 carbon atoms?
6. How many grams of ammonium carbonate are in the previous problem?
SODIUM PHOSPHATE
1. What is the molar mass of sodium phosphate?
2. What is the mass percent of each element?
3. How many sodium atoms are in 5.55 g sodium phosphate?
4. How many grams of O are in a mass of sodium phosphate that contains 3.69 moles of phosphorus?
5. How many grams of phosphorus are in 1 sodium phosphate molecule?
6. How many oxygen atoms are 4.75 moles of sodium phosphate?
TURQUOISE: CuAl6(PO4)4(OH)8·4H2O
1. How many total atoms are in 5.00 g turquoise?
2. How many water molecules are in a sample of turquoise with a mass of 10.0 g?
3. How many milligrams turquoise contain 3.75 × 1022 atoms of oxygen?
4. How many phosphate ions are in a sample of turquoise that contains 435 microgram of hydrogen?
5. What is the mass of hydrogen in a sample of turquoise that contains 3.50 milligrams of O?
ACETAMINOPHEN: C8H9O2N
1. What is the molar mass?
2. What is the mass percent of each element in acetaminophen?
3. How many hydrogen atoms are in 25 g of acetaminophen?
4. How many grams of carbon are in 10.55 g of acetaminophen?
5. How many grams of O are in a sample of acetaminophen that contains 9.64 × 1026 carbon atoms.
COMBUSTION REACTIONS: PROPANE (C3H8)
1. Write the balanced equation for the combustion of propane.
2. Calculate the mass (in grams) of carbon dioxide and water that will be produced from the burning of
25.00 g of propane.
3. In another combustion reaction, 3.75 moles of carbon dioxide were produced. How many oxygen
atoms were consumed in this process? How many grams of propane were burned?