Empirical vs Molecular Formulas
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62 Terms
A formula shows the exact number of each type of atom in a compound. What type of formula is it?
Molecular formula
A formula shows the lowest whole-number ratio of atoms in a compound. What type of formula is it?
Empirical formula
Which formula type is always the simplest ratio?
Empirical formula
Which formula type tells the actual number of atoms in one molecule?
Molecular formula
Can the empirical formula and molecular formula be the same?
Yes
When finding an empirical formula from a molecular formula, what should you divide the subscripts by?
The greatest common factor
If all subscripts already cannot be reduced, what is the empirical formula?
The same formula
What is the empirical formula of C₂H₄?
CH₂
What is the empirical formula of H₂O₂?
HO
What is the empirical formula of C₆H₆?
CH
What is the empirical formula of C₂H₂?
CH
What is the empirical formula of N₂O₄?
NO₂
What is the empirical formula of SO₂?
SO₂
What is the empirical formula of NO₂?
NO₂
What is the empirical formula of C₃H₆?
CH₂
What is the empirical formula of C₄H₈?
CH₂
What is the empirical formula of C₆H₁₂?
CH₂
What is the empirical formula of C₁₂H₁₄O₆?
C₆H₇O₃
What is the empirical formula of C₄H₁₀?
C₂H₅
What is the empirical formula of C₆H₁₄?
C₃H₇
What is the empirical formula of C₈H₁₈?
C₄H₉
What is the empirical formula of C₁₀H₂₂?
C₅H₁₁
What is the empirical formula of P₄O₁₀?
P₂O₅
What is the empirical formula of S₂O₆?
SO₃
What is the empirical formula of C₆H₁₂O₆?
CH₂O
What is the empirical formula of C₂H₆O₂?
CH₃O
What is the empirical formula of C₅H₁₀O₅?
CH₂O
What is the empirical formula of C₃H₈?
C₃H₈
What is the empirical formula of CH₄?
CH₄
What is the empirical formula of H₂O?
H₂O
What is the empirical formula of CO₂?
CO₂
What is the empirical formula of NH₃?
NH₃
What is the empirical formula of Al₂O₃?
Al₂O₃
What is the empirical formula of MgO?
MgO
Why is CaO not written as Ca₂O₂?
Empirical formulas must be in the lowest whole-number ratio
Which compounds have the same empirical formula: C₂H₂ and C₆H₆?
Yes, both are CH
Which compounds have the same empirical formula: N₂O₄ and NO₂?
Yes, both are NO₂
Which compounds have the same empirical formula: C₃H₆ and C₄H₈?
Yes, both are CH₂
Which compounds have the same empirical formula: C₆H₁₂ and C₄H₈?
Yes, both are CH₂
Which compounds have the same empirical formula: SO₂ and NO₂?
No
Which compounds have the same empirical formula: C₂H₄ and C₃H₆?
Yes, both are CH₂
Which compounds have the same empirical formula: H₂O₂ and H₂O?
No
Which compounds have the same empirical formula: C₆H₁₂O₆ and CH₂O?
Yes
A molecule contains 12 carbon atoms, 14 hydrogen atoms, and 6 oxygen atoms. What is its empirical formula?
C₆H₇O₃
Why is C₁₂H₁₄O₆ reduced to C₆H₇O₃?
All subscripts can be divided by 2
A molecule has formula C₆H₆. What does the molecular formula tell you?
One molecule has 6 carbon atoms and 6 hydrogen atoms
A molecule has empirical formula CH. What does that tell you?
The carbon to hydrogen ratio is 1:1
A compound has empirical formula CH₂. What does that tell you?
The carbon to hydrogen ratio is 1:2
A compound has empirical formula NO₂. What does that tell you?
The nitrogen to oxygen ratio is 1:2
A molecular formula is C₄H₈. What is the ratio of carbon to hydrogen?
1:2
A molecular formula is C₆H₆. What is the ratio of carbon to hydrogen?
1:1
A molecular formula is N₂O₄. What is the ratio of nitrogen to oxygen?
1:2
A molecular formula is C₁₂H₁₄O₆. What is the ratio after simplifying?
6:7:3
If a molecular formula is exactly 2 times the empirical formula CH₂, what is the molecular formula?
C₂H₄
If a molecular formula is exactly 3 times the empirical formula CH₂, what is the molecular formula?
C₃H₆
If a molecular formula is exactly 6 times the empirical formula CH, what is the molecular formula?
C₆H₆
If a molecular formula is exactly 2 times the empirical formula NO₂, what is the molecular formula?
N₂O₄
If the empirical formula is CH₂O and the multiplier is 6, what is the molecular formula?
C₆H₁₂O₆
If the empirical formula is HO and the multiplier is 2, what is the molecular formula?
H₂O₂
Which formula gives more detailed information: empirical or molecular?
Molecular formula
Which formula is more reduced: empirical or molecular?
Empirical formula
For ionic compounds, the written formula is usually what type of formula?
Empirical formula