Empirical and Molecular Formulas

A formula with the lowest whole # ratio of elements in a compound is called

• empirical formula
• chemical formula
• covalent formula
• molecular formula

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

• ionic formula
• covalent formula
• empirical formula
• molecular formula

Which of the following is an empirical formula?

• N₂O
• Na₂SO₄
• N₂O₄
• Al₃(SO₄)₂

All of the following are empirical formulas EXCEPT

• C₃H₈
• Na₂SO₄
• N₂O₄
• Al₃(SO₄)₂

Which of the following is the correct empirical formula for C₄H₁₀

• C₂H₅
• CH_2.5
• C₈H₂₀
• C₄H₁₀

A substance has a molecular formula of C₈H₁₀N₄O₂. The empirical formula is 

• CHNO
• C₂H₆N₂O
• C₄H₅N₂O
• C₉H₇N₃O

A compound is 25.9 % nitrogen and 74.1% oxygen. Find its empirical formula. 

• N₂O₄
• NO
• N₂O₅
• N₄O₆

Determine the empirical formula for a compound with 87.1% Ag and 12.9% S. 

• AgS₂
• Ag₃S₅
• Ag₂S
• Ag₄S₂

The empirical formula of a substance is CH₂O. Its molar mass is 180. What is the molecular formula?

• C₆H₁₂O₆
• C₄H₈O₄
• C₈H₁₆O₈
• C₂H₄O₂

Epinephrine (adrenaline) is a hormone secreted into the bloodstream in times of stress. It contains 59.0%  C, 7.15% H, 26.20%O, 7.65%N and has a molar mass of 183 g/mol. What is its molecular formula? 

• C₉H₁₃NO₃
• C₅H₁₁N₃O₂
• C₈H₁₂NO₂
• C₇H₉N₂O