What is the primary difference between an empirical formula and a molecular formula?

Molecular and Empirical Formulas

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Chemistry
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9th - 12th Grade
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Hard

Patricia Brown
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Empirical formula shows the smallest whole number ratio of atoms.
Empirical formula shows the actual number of atoms in a compound.
Molecular formula is always simpler than the empirical formula.
Molecular formula shows the smallest whole number ratio of atoms.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is the first step in determining an empirical formula?
Find the molecular formula mass.
Find the percent composition of each element.
Convert moles to grams.
Multiply by a number to get whole numbers.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When converting percent composition to moles, what sample size is typically assumed?
10 grams
1 gram
50 grams
100 grams
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the example problem, what is the empirical formula for a compound with 25.9% nitrogen and 74.1% oxygen?
NO
N2O
NO2.5
N2O5
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of dividing the moles of each element by the smallest number of moles?
To simplify the ratio to the smallest whole numbers.
To find the molecular formula.
To calculate the molar mass.
To convert moles to grams.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in finding the molecular formula?
Calculate the molecular formula mass.
Multiply the subscripts by a number.
Find the empirical formula.
Divide the molecular formula mass by the empirical formula mass.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you find the empirical formula mass?
By adding the atomic masses of all atoms in the empirical formula.
By dividing the molecular formula mass by the empirical formula mass.
By multiplying the subscripts by the atomic masses.
By adding the atomic masses of all atoms in the molecular formula.
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