Empirical Formulas

Open Ended

Find the percent composition of H₂O

Multiple Choice

Lithium phosphide (three lithium atoms with one phosphorus atom) has a chemical formula of Li₃P. If you look at the total atomic mass of Li₃P, does lithium or phosphorus make up more of the mass?

• lithium

• phosphorus

• they are exactly the same

• it is impossible to tell

Multiple Choice

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

• 29%

• 43%

• 57%

• 73%

Multiple Choice

What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?

• 29%

• 43%

• 57%

• 73%

Multiple Choice

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

• C₃H₆
• CH₂
• C₂H₄
• CH₃

Multiple Choice

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

• C₃H₆
• CH₂
• C₂H₄
• CH₃

Multiple Choice

Which one is an empirical (cannot be simplified further)

• H₂O₂

• C₂H₆O₁₂

• CaCl₂

• N₂O₈

Multiple Choice

What is the empirical formula for the following:
Pb₅Cr₅O₂₀

• Pb₂Cr₂O₁₀
• PbCr₂O₇
• Pb₉Cr₄O₂
• PbCrO₄

Multiple Choice

What is the empirical formula for the following molecular formula: C₆H₁₄

• C₆H₁₄

• C₃H₇

• CH₂

• CH₃

Multiple Choice

What is the Empirical Formula for Dibroane

• BH

• BH₃

• B₂H₆

• BH₂

Multiple Choice

What is the Molecular Formula for Dibroane

• BH

• BH₃

• B₂H₆

• BH₂

Open Ended

Explain how you would determine the percent composition of diborane

(how do you get the numbers just shown?)

Open Ended

What would the percentage of diborane be if we only had 50 grams?