Empirical Formulas

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.
• is the simplest whole-number ratio of moles of elements in the compound.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)

• SO
• SO₂
• SO₃
• SO₄

What is the empirical formula of the following molecular formula:  C₃H₆

• C₃H₆
• CH₂
• C₂H₄
• CH₃

Which one is empirical?

• H₂O₂
• C₂H₆O₁₂
• CaCl₂
• N₂O₈

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

What is the empirical formula for a compound containing the following ratio:
3Na:1P:4O

• NaPO₄
• Na₃P₄O
• Na₃PO₄
• NaPO

What is the percentage of chlorine in sodium chloride? (NaCl)

• 60.7%
• 39.3%
• 60%
• 40%

What is the mass of one mole of aluminum?

• 27 g
• 13 g
• 54 g
• 14 g

How many grams of Hydrogen are there in 25 moles of water?

• 25 g
• 450 g
• 18 g
• 50 g

Tags

NGSS.HS-PS1-7

How many grams  are in 2.25 moles of propane, C₃H₈. 

• 99 g
• 16.0 g
• 0.051 g
• 96.0 g