Honors Chemistry Unit 9 Review

Determine the empirical formula of a compound that contains 28.4% copper and 71.6% bromine.

• CuBr

• CuBr2

• Cu2Br

• Cu2Br3

Determine the empirical formula of a compound that contains 5.28 g Sn and 3.37 g F. Choose the correct empirical formula.

• SnF4

• SnF3

• Sn2F5

• SnF2

Determine the empirical formula for the sample with 36.2% aluminum and 63.8% sulfur.

• Al2S3

• AlS

• Al2S

• AlS2

A compound is analyzed and found to have the empirical formula of CH₂O. If the molar mass of the compound is 150.15 g/mol, what is the molecular formula of the compound?

• C5H10O5

• C4H8O4

• C6H12O6

• C3H6O3

A compound contains 63.1% carbon, 12.4% hydrogen, and 24.5% nitrogen. Determine the molecular formula of the compound if its molar mass is 114.22 g/mol.

• C3H7N

• C6H14N

• C9H21N

• C12H28N

The percentage composition of Mg(NO₃)₂ is calculated as follows. Given the molar mass of Mg(NO₃)₂ is approximately 148.33 g/mol (Mg = 24.31 g/mol, N = 14.01 g/mol, O = 16.00 g/mol), the composition percentages are: Mg ≈ 16.39%, N ≈ 18.88%, and O ≈ 64.73%.

• Mg: 16.39%, N: 18.88%, O: 64.73%

• Mg: 14.00%, N: 14.00%, O: 72.00%

• Mg: 20.00%, N: 15.00%, O: 65.00%

• Mg: 18.00%, N: 20.00%, O: 62.00%

The percentage composition of caffeine (C₈H₁₀N₄O₂) is:

• C: 49.5%, H: 5.2%, N: 28.9%, O: 16.5%

• C: 45.0%, H: 6.0%, N: 32.0%, O: 17.0%

• C: 50.0%, H: 5.0%, N: 30.0%, O: 15.0%

• C: 48.0%, H: 5.5%, N: 29.0%, O: 17.5%

What is the percent carbon in ibuprofen (Advil®): C₁₃H₁₈O₂? Calculate the value.

• 70.0%

• 75.7%

• 80.0%

• 85.0%

Determine the percent water in ZnSO₄•7H₂O.

• 43.9%

• 37.5%

• 50.5%

• 61.2%

Calculate the grams of oxygen present in 90.0 g of potassium oxide. (Answer with a short and concise value)

• 15.3 g

• 30.6 g

• 22.7 g

• 12.8 g

Tags

NGSS.HS-PS1-7