A sample an unknown compound contains 49.34 g calcium, 25.43 g phosphorus, and 52.54 g oxygen.  What is the empirical formula of the compound?

Analysis of a 20.0-gram sample of a compound containing only calcium and bromine indicates that 4.00 grams of calcium are present. What is the empirical formula of the compound formed?

If you have an 8.53 mg sample of phosphorus oxychloride and it contains 1.72 mg of phosphorus, what is the percent composition of the phosphorus in the compound?

A compound contains only carbon, hydrogen, and oxygen. Combustion of 10.68 mg of the compound yields 15.40 mg CO2 and 7.88 mg H2O. The molar mass of the compound is 122.1 g/mol. What are the empirical and molecular formulas of the compound?

A 60.00 g sample of tetraethyl lead, a gasoline additive, is found to contain 38.43 g lead, 17.83 g carbon, and 3.74 g hydrogen. Find its empirical formula.

A sulfide of iron is produced when 2.33 g of iron reacts with 1.926 g of sulfur. What is the empirical formula for the compound? Could this salt exist based on irons proffered ionic charges?

A sample of a white solid contains 0.212 g of magnesium and 0.140 g oxygen. What is the empirical formula of this compound?   Mg2O2   MgO2   Mg2O   MgO

Consider a sample of carbon tetrafluoride that contains 1.39 × 10²⁴ atoms of fluorine.  Using the formula CF₄ and that you have 2.31 moles of F, determine What quantity in moles of carbon tetrafluoride are present.

Consider a sample of carbon tetrafluoride that contains 1.59 × 1024 atoms of fluorine. Using the formula CF4, What quantity in moles of fluorine are present?

Vitamin c is known chemically by the name ascorbic acid. Determine the empirical formula of ascorbic acid if it is composed of 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen.