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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Calculate the number of moles in 50.0 g of sodium chloride (NaCl).
💡 Hint: Use the number of moles = mass / molar mass.
Question 2
Easy
What is the molar mass of calcium carbonate (CaCO₃)?
💡 Hint: Add the atomic masses of Ca, C, and O.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is Avogadro's number?
💡 Hint: This number is the bridge between microscopic and macroscopic amounts.
Question 2
A limiting reagent is defined as:
- The reagent in excess
- The reagent that is completely consumed
- The catalyst in a reaction
💡 Hint: Think about the reagent that runs out first in a chemical reaction.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
You have 10.0 g of magnesium and 50.0 g of O₂. Determine the limiting reagent and calculate the theoretical yield of MgO.
💡 Hint: Start by writing the balanced equation: 2 Mg + O₂ → 2 MgO.
Question 2
A solution contains 5 g of NaCl in 250 mL. How many moles of NaCl are in the solution? If you dilute this solution to 500 mL, what is the new molarity?
💡 Hint: Molarity = moles of solute / liters of solution.
Challenge and get performance evaluation