Advanced Chemistry Chapter 3 Quiz

Calculate the molar mass of Pb(CO₃)₂

• 235.23 g/mol

• 311.24 g/mol

• 327.24 g/mol

• 384.11 g/mol

Calculate the molar mass of magnesium phosphate

• 119.28 g/mol

• 167.90 g/mol

• 262.87 g/mol

• 357.84 g/mol

Calculate the percent of oxygen in N₃O₇. Give the answer to two decimal places

Calculate the percent of oxygen in calcium nitrate. Give the answer to two decimal places

How many grams of helium are in 7.23 x 10²⁴ atoms of helium? Answer to the correct number of significant figures, and omit units in your answer.

How many moles of Ag₂S are in 4.14 x 10²³ atoms of Ag₂S? Answer to the correct number of significant figures, and omit units in your answer.

Determine the empirical formula for a compound that contains 52.92% aluminum and 47.08% oxygen. Write your answer in the order it was given (i.e. H2O)

The empirical formula of a compound is C₂H₆O. If the molecular mass of the compound is 138 g/mol, what is the molecular formula? Write your answer in the order it was given (i.e. H2O)

Determine the molecular formula for a compound that contains 38.69% C, 9.76% H, and 51.55% O and has a molecular mass of 124 g/mol. Write your answer in the order it was given (i.e. H2O)

4.61 g of a sample was burned in excess oxygen and produced 10.13 g of CO₂ and 5.53 g of H₂O. Calculate the empirical formula of the original compound.