Unit 5 Quiz

Calculate the molar mass of MgF₂.

• 62.30 g/mol

• 45.31 g/mol

• 82.30 g/mol

• 95.21 g/mol

What is the formula for percent composition?

• Total mass of element (part) / Total Mass (whole) x 100%

• Total mass of element (whole) / Total Mass (part) x 100%

• Total mass of element (part) x Total Mass (whole) x 100%

• Total mass of element (whole) x Total Mass (part) x 100%

What is the mass of Hydrogen in H₂O?

• 2.02g

• 16.00g

• 18.02g

• 1.01g

What is the percent composition of Hydrogen in water?

• 11.11%

• 88.79%

• 50.00%

• 25.00%

What is the empirical formula of a compound with 11.11% hydrogen and 88.89% oxygen?

• H₂O

• H₂O₂

• HO

• H₃O

After converting mass to moles, what is the next step to find the empirical formula?

• Convert percentage to grams

• Divide by the smallest number of moles

• Round to whole numbers

• Add the moles together

What is the empirical formula for C₂H₄O₂?

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• CHO

What is the empirical formula of C₆H₁₂O₆?

• CH₂O

• C₆H₁₂O₆

• C₃H₆O₃

• C₂H₄O₂

What is the empirical formula of a compound with 50% sulfur and 50% oxygen?

• SO

• SO₂

• S₂O

• S₂O₃

What is the mass of nitrogen (N)?

• 14.01 g/mol

• 32.06 g/mol

• 46.07 g/mol

• 138 g/mol