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 molar mass of oxygen (O)?
💡 Hint: Check the periodic table for the atomic mass.
Question 2
Easy
How many grams are in one mole of carbon (C)?
💡 Hint: Refer to the atomic weight of carbon.
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 definition of molar mass?
- Mass of one mole of substance
- Mass of a single atom
- Mass of particles in a sample
💡 Hint: Think about how we measure amounts of substances in chemistry.
Question 2
The molar mass of H₂ is 2 g/mol.
- True
- False
💡 Hint: Consider the molecular formula and how to calculate it.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A sample contains 24 grams of carbon dioxide (CO₂). Calculate the number of moles in the sample.
💡 Hint: Use the formula: moles = mass / molar mass.
Question 2
If 7.5 grams of sodium (Na) are added to 300 mL of water, what is the molarity of the sodium in solution?
💡 Hint: Convert grams to moles, then divide by volume in liters.
Challenge and get performance evaluation