Formula Mass Calculation Worksheet
Calculate the formula mass of various chemical compounds using atomic masses from the periodic table.
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Formula Mass Calculation Worksheet
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Instructions: Calculate the formula mass for each of the following compounds. Use the atomic masses provided in the periodic table snippet. Show your work for full credit. Round your answers to two decimal places.
Refer to the atomic masses in the periodic table snippet below for your calculations:
Common Atomic Masses (amu): H=1.01, C=12.01, O=16.00, Na=22.99, Cl=35.45, Ca=40.08, S=32.07, N=14.01, K=39.10, Mg=24.31, Fe=55.85
1. The sum of the atomic masses of all atoms in a chemical formula is called the .
2. The unit for formula mass is typically .
3. To find the formula mass of a compound, you need to know the of each element present and the number of of each element.
1. Calculate the formula mass of water (H₂O).
2. Determine the formula mass of carbon dioxide (CO₂).
3. Find the formula mass of sodium chloride (NaCl).
1. Which of the following compounds has the largest formula mass?
CH₄
NH₃
H₂S
HCl
2. What is the approximate formula mass of calcium chloride (CaCl₂)?
75.55 amu
110.98 amu
146.90 amu
182.35 amu
1. Calculate the formula mass of sulfuric acid (H₂SO₄).
2. Determine the formula mass of potassium hydroxide (KOH).