Mole Calculation Problems

Study Notes

These questions cover mole calculations, molar mass determination, and conversions between mass, moles, molecules, and solution concentrations.

To find the number of moles in 75 grams of sodium (Na), use the molar mass of Na (approximately 23 g/mol)
To find the number of moles in 200 grams of glucose (C₆H₁₂O₆), use the molar mass of glucose (approximately 180 g/mol)
To find the number of moles in 150 grams of potassium (K), use the molar mass of K (approximately 39.1 g/mol)
To find the number of moles in 90 grams of iron (Fe), use the molar mass of Fe (approximately 55.8 g/mol)
To find the number of moles in 250 grams of lead(II) nitrate (Pb(NO₃)₂), use the molar mass of Pb(NO₃)₂ (approximately 331.2 g/mol)
To find the number of moles in 60 grams of nitrogen gas (N₂), use the molar mass of N₂ (approximately 28 g/mol)
To find the number of moles in 80 grams of sulfur (S), use the molar mass of S (approximately 32.1 g/mol)
To find the number of moles in 100 grams of calcium (Ca), use the molar mass of Ca (approximately 40.1 g/mol)
To find the number of moles in 150 grams of silver (Ag), use the molar mass of Ag (approximately 107.9 g/mol)
To find the number of moles in 120 grams of magnesium (Mg), use the molar mass of Mg (approximately 24.3 g/mol)

To find the number of molecules in 0.5 moles of CO₂, multiply by Avogadro's number (6.022 x 10²³)
To find the number of molecules in 4 moles of NH₃, multiply by Avogadro's number (6.022 x 10²³)
To find the number of molecules in 0.35 moles of CH₄, multiply by Avogadro's number (6.022 x 10²³)
To find the number of molecules in 2.5 moles of Na₂SO₄, multiply by Avogadro's number (6.022 x 10²³)
To find the number of molecules in 3 moles of ethanol (C₂H₅OH), multiply by Avogadro's number (6.022 x 10²³)

To find the molar mass of calcium carbonate (CaCO₃), sum the atomic masses of Ca, C, and 3 O
Molar mass of CaCO₃ = 40.1 + 12.0 + (3 x 16.0) = 100.1 g/mol

To find the number of grams in 1.5 moles of NaCl, use the molar mass of NaCl (approximately 58.5 g/mol)
To find the number of grams in 10 moles of H₂, use the molar mass of H₂ (approximately 2 g/mol)
To find the number of grams in 0.25 moles of sulfuric acid (H₂SO₄), use the molar mass of H₂SO₄ (approximately 98.1 g/mol)
To find the number of grams in 0.8 moles of ethyl alcohol (C₂H₅OH), use the molar mass of C₂H₅OH (approximately 46.1 g/mol)
To find the number of grams in 3 moles of potassium chloride (KCl), use the molar mass of KCl (approximately 74.6 g/mol)
To find the number of grams in 0.2 moles of sodium bicarbonate (NaHCO₃), use the molar mass of NaHCO₃ (approximately 84.0 g/mol)
To find the number of grams in 5 moles of aluminum (Al), use the molar mass of Al (approximately 27 g/mol)
To find the number of grams in 0.3 moles of potassium sulfate (K₂SO₄), use the molar mass of K₂SO₄ (approximately 174.3 g/mol)
To find the number of grams in 1.2 moles of acetic acid (CH₃COOH), use the molar mass of CH₃COOH (approximately 60.1 g/mol)
To find the number of grams in 0.4 moles of hydrochloric acid (HCl), use the molar mass of HCl (approximately 36.5 g/mol)
To find the number of grams in 1.8 moles of ammonium sulfate ((NH₄)₂SO₄), use the molar mass of (NH₄)₂SO₄ (approximately 132.1 g/mol)
To find the number of grams in 0.5 moles of copper sulfate (CuSO₄), use the molar mass of CuSO₄ (approximately 159.6 g/mol)

To find the number of moles in 50 mL of a 2 M NaOH solution, convert mL to liters (0.050 L) and multiply by the molarity
To find the number of moles in 10 liters of a 0.5 M solution, multiply the volume by the molarity
To find the number of moles in 1 liter of a 0.5 M HCl solution, multiply the volume by the molarity
To find the number of moles in 200 mL of a 0.25 M solution, convert mL to liters (0.200 L) and multiply by the molarity
To find the number of moles in 400 mL of a 1.5 M solution, convert mL to liters (0.400 L) and multiply by the molarity
To find the number of moles in 50 mL of a 4 M solution, convert mL to liters (0.050 L) and multiply by the molarity