Practice - Calculating Reacting Masses and Product Masses
Practice Questions
Test your understanding with targeted questions
Calculate how many moles are in 40.08 g of calcium (Ca).
💡 Hint: Use the molar mass formula: Moles = Mass / Molar Mass.
How many molecules are in 2.50 moles of NaCl?
💡 Hint: Multiply moles by Avogadro's constant, which is 6.022 × 10²³.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the molar mass of water (H₂O)?
💡 Hint: Calculate using the atomic mass from the periodic table.
True or False: 1 mole of any substance contains exactly 6.022 × 10²³ particles.
💡 Hint: Think about how the mole relates to Avogadro's constant.
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Challenge Problems
Push your limits with advanced challenges
A reaction produces 5.0 moles of ammonia (NH₃) from nitrogen (N₂) and hydrogen (H₂). If the balanced equation is N₂ + 3H₂ → 2NH₃, how many grams of N₂ are needed?
💡 Hint: Don’t forget to convert moles of N₂ to grams using its molar mass.
How many grams of O₂ are needed to produce 150 g of CO₂ from the reaction C + O₂ → CO₂?
💡 Hint: Ensure you're balancing the equation correctly.
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Reference links
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