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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Calculate the molar mass of methane (CH4).
💡 Hint: Add the atomic masses of carbon and hydrogen.
Question 2
Easy
What is the mass percent of Na in sodium sulfate (Na2SO4)?
💡 Hint: Use the formula: (mass % of element = (number of atoms of element × atomic mass of element) / molar mass of compound × 100)
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 the molar mass of a compound with the formula C3H8?
- 44.09 g/mol
- 58.12 g/mol
- 36.05 g/mol
💡 Hint: Remember to sum the individual atomic masses.
Question 2
True or False: The empirical formula always represents the actual number of atoms in a molecule.
- True
- False
💡 Hint: Think about the definitions of empirical and molecular formulas.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
If 5 mL of a 2 M NaCl solution is diluted to a final volume of 500 mL, what is the concentration of the diluted solution?
💡 Hint: Use the dilution formula: C1V1 = C2V2.
Question 2
A compound C consists of 10 g of carbon and 30 g of oxygen. Find the empirical formula.
💡 Hint: Calculate moles and simplify the ratios.
Challenge and get performance evaluation