Mole Concept Practice Problems

Select the statement that correctly describes Avogadro's number.

Which correctly defines a mole?

Carrollite, a mineral that serves as an ore source of copper and cobalt, has the chemical formula CuCo₂S₄. Calculate the number of moles of carrollite in a sample containing 4.66×10²⁵ atoms of Co.

Phenylephrine is a nasal decongestant medication with the molecular formula C₉H₁₃NO₂. Determine the number of moles of phenylephrine that contain 8.46×10²³ atoms of hydrogen.

Sodium sorbate, C₆H₇O₂Na, is used as a food preservative to prevent the growth of mold and yeast. Calculate the number of C atoms present in 0.214 moles of sodium sorbate.

The most commonly utilized fertilizer in the world is diammonium phosphate (DAP), (NH₄)₂HPO₄. It is an excellent source of phosphorus and nitrogen. Determine the number of formula units present in 0.148 moles of DAP.

What is the mass (in g) of a sample containing 4.15 moles of (C₅H₆N)₂SO₄?

How many grams are in 0.487 moles of C₆H₁₁OH?

Consider the molecular models shown in the figure below (gray = C, white = H, red = O, blue = N, yellow-green = F). Determine the number of moles for Compound I and Compound II if each has a mass of 28.0 grams.

Refer to the molecular models shown below (gray = carbon, white = hydrogen, red = oxygen, yellow-green = fluorine). Calculate the number of moles present in 15.0 g of each compound.

Carbon dioxide (CO₂) is one of the products during the combustion of a hydrocarbon.

How many moles of CO₂ are produced from the combustion of 1.50 kg of decane (C₁₀H₂₂)?

A sample contains 3.25 moles of Rb ₂C₂O₄. How many moles of ions are present in the sample?

Determine which is heavier: 0.755 mol or 104 g of butylurea (C₅H₁₂N₂O).

Calculate the mass of 5.33×10²³ atoms of Nitrogen-14 (14.003 g/mol).

Report your answer in amu and grams. Determine the mass of a single Nitrogen-14 atom (14.003 g/mol).

An iron supplement tablet contains 325 mg of ferrous sulfate (FeSO₄). Determine the number of moles of ferrous sulfate in one tablet.

Sucrose, known as table sugar, has a chemical formula of C ₁₂H₂₂O₁₁. Suppose an average of 4.20 g of table sugar is commonly added to a cup of coffee; how many moles of table sugar is consumed?

A mineral supplement known as potassium citrate, K₃C₆H₅O₇ (MW = 306.395 g/mol), is used to treat or prevent low blood potassium levels. Determine the mass of potassium citrate (in mg) that should be taken to provide the recommended daily intake of potassium which is 4,700.00 mg.

The mass of an S atom is 32.07 amu. Determine the number of S atoms in 32.07 g of sulfur.

One Sb atom has a mass of 2.0219×10⁻²² g. Determine its mass in atomic mass units.

To relieve mild pains and muscle aches, Epsom salt (MgSO₄) is added in warm baths. If a foot bath contains 2.55×10²⁴ formula units of MgSO₄, calculate the number of moles of MgSO₄ and the mass of MgSO₄ in grams present in the bath.

In a sample of 0.500 moles of K₂Cr₂O₇, determine the number of K⁺ ions and Cr₂O₇^2– ions.

Calculate the moles of zinc in 6.36 x 10 ²⁵ Zn atoms.

Calculate the mass of nitrogen in grams in a 15.5 g sample of dinitrogen pentoxide.

How many moles of BaCl₂ in 56.3 g of the compound?

A person weighing 72 kg has 7.4 × 10⁻³ mol of hemoglobin in their blood. Calculate the number of hemoglobin molecules and its mass in grams given that the molar mass of hemoglobin is 64,456 g/mol.

Calculate the mass of 6.31 x 10 ²⁴ molecules of a substance that has a molar mass of 241.86 g/mol.

A sample of Nickel weighs 69.782 g. Calculate the mass of phosphorus in grams if it has the same number of atoms as the nickel sample.

Calculate the mass in kilograms of 6.93 moles of Chromium

Calculate the mass of iron(III) nitrate is needed if 9.63 moles of Fe(NO₃)₃ reacted.

Calculate the moles of O atoms in each of the given amounts of compounds

Identify which of the following samples will have the least amount of atoms.