Mole Concept Numericals
Practice problems with interactive solutions
Key Concepts
- 1 mole = 6.022 × 10²³ particles (Avogadro’s number)
- Molar mass = mass of 1 mole of a substance (g/mol)
- Number of moles = Given mass / Molar mass
- Number of particles = Moles × Avogadro’s number
Calculate the number of moles in 25 grams of water (H₂O).
How many molecules are present in 0.5 moles of carbon dioxide (CO₂)?
What is the mass of 2.5 moles of sodium chloride (NaCl)?
Calculate the number of oxygen atoms in 88 grams of carbon dioxide (CO₂).
How many moles of hydrogen atoms are present in 18 grams of water (H₂O)?
Calculate the number of oxygen atoms in 88 grams of carbon dioxide (CO₂).
What is the mass of 1.5 × 10²³ molecules of glucose (C₆H₁₂O₆)?
How many moles of electrons are present in 9 grams of water?
Calculate the number of nitrogen atoms in 56 grams of nitrogen gas (N₂).
What is the mass of 3.011 × 10²² molecules of oxygen gas (O₂)?
Calculate the number of moles in 1 liter of water (density = 1 g/mL).
How many moles of sodium ions are present in 29.25 grams of NaCl?
Calculate the mass of 0.25 moles of calcium carbonate (CaCO₃).
How many molecules are present in 0.25 moles of ammonia (NH₃)?
What is the mass of 1.8066 × 10²⁴ atoms of carbon?
Calculate the number of moles in 5.6 liters of oxygen gas at STP.
How many atoms are present in 0.1 moles of phosphorus (P₄)?
What is the mass of 3.01 × 10²¹ molecules of sulfuric acid (H₂SO₄)?
Calculate the number of moles of electrons in 51 grams of ammonia (NH₃).
How many moles of sodium sulfate (Na₂SO₄) contain 1.2 × 10²⁴ sulfate ions?
Challenge Problems
Try solving these advanced mole concept problems:
What is the mass of 3.011×10²³ molecules of nitrogen gas (N₂)?
Calculate the number of moles in 1 liter of water (density = 1 g/mL).
How many atoms are present in 56 grams of nitrogen gas (N₂)?
What is the mass of 1.2044×10²⁴ molecules of oxygen gas (O₂)?
Calculate the number of moles of electrons in 9 grams of water (H₂O).