Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the empirical formula for a compound containing 50.0% carbon and 50.0% hydrogen?
💡 Hint: Convert grams to moles for C and H.
Question 2
Easy
Balance the equation: H₂ + O₂ → H₂O.
💡 Hint: Start by balancing the oxygen first.
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 empirical formula of a compound containing 40% sulfur and 60% oxygen?
💡 Hint: Convert mass percentages to moles.
Question 2
True or False: The molecular formula can be the same as the empirical formula.
💡 Hint: Consider the simplest forms.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A sample contains 2.00 g of a compound with 48.37% carbon, 7.42% hydrogen, and 44.21% oxygen. Determine the empirical and molecular formulas assuming a molar mass of 88.00 g/mol.
💡 Hint: Remember to convert masses to moles and simplify.
Question 2
A school laboratory uses a 10.0 M HCl solution and needs to prepare 500 mL of a 1.0 M solution for experiments. How much concentrated acid is needed?
💡 Hint: Make sure your units match (liters to mL).
Challenge and get performance evaluation