
Calculating Empirical Formulas in Chemistry: Steps and Examples

Interactive Video
•
Chemistry, Mathematics, Science
•
9th - 10th Grade
•
Hard

Patricia Brown
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in calculating the empirical formula of a compound?
Calculate the number of moles of each element
Highlight the atoms and their relative atomic masses
Find the simplest whole number ratio
Convert percentages to grams
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In Example 1, what is the relative atomic mass of oxygen used in the calculation?
16 grams
1 gram
32 grams
12 grams
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you find the simplest whole number ratio in empirical formula calculations?
Divide all moles by the smallest number
Subtract the smallest mole from the largest
Add all moles together
Multiply all moles by the largest number
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the empirical formula of the compound in Example 1?
S2O4H
SO4H2
SO2H4
SO4H
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In Example 2, what is the percentage composition of carbon?
29.07%
5.49%
65.44%
32.65%
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the relative atomic mass of carbon used in Example 2?
32
12
16
1
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the number of moles from percentage composition?
Add the percentage to the relative atomic mass
Subtract the relative atomic mass from the percentage
Divide the percentage by the relative atomic mass
Multiply the percentage by the relative atomic mass
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