Molecular Formula Percent Composition

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

• C₃H₆

• CH₂

• C₂H₄

• CH₃

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

• Cu₃O₈

• CuO₄

• Cu₂O

• Cu₄O₁₀

Glycerol has a molar mass of 92.09 g/mol. Its percent composition by mass is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula?

• C₂H₃O₂

• CH₂O

• C₂H₄O₂

• C₃H₈O₃

The mass percent of hydrogen in methane (CH₄) is:

• 75%

• 92%

• 25%

• 4%

Tags

NGSS.HS-PS1-7

What is the mass percentage of carbon in carbon dioxide (CO₂)?

• 27.27%

• 42.86%

• 72.73%

• 72.72%

Tags

NGSS.HS-PS1-7

Find the percentage composition of Mg in Mg₃(PO₄)₂.

• 27.48% Mg

• 43.11% Mg

• 16.00% Mg

• 12.63% Mg

The mass % of aluminum in aluminum sulfate Al₂(SO₄)₃ is:

• 45.70%

• 7.89%

• 35.94%

• 15.77%

What is the empirical formula of a compound with 88.80% copper and 11.20% oxygen by mass?

• Cu₃O₈

• CuO₄

• Cu₂O

• Cu₄O₁₀

Tags

NGSS.HS-PS1-7

A chemical formula (sometimes called the real or true formula) that shows the actual number and kinds of atoms present in one molecule of a compound is called_________

• ionic formula

• covalent formula

• empirical formula

• molecular formula

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18 g/mol?

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆