4.5.2.1 - Rules for Counting Atoms
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
How many hydrogen atoms are in H₂O?
💡 Hint: Look at the subscript after 'H'.
What is the total number of atoms in CO₂?
💡 Hint: Add the number of each type of atom.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What does a subscript indicate in a chemical formula?
💡 Hint: Think about how many hydrogens are in H₂O.
True or False: Parentheses in chemical formulas do not affect the count of atoms.
💡 Hint: Consider how (OH)₂ means two groups of two atoms.
1 more question available
Challenge Problems
Push your limits with advanced challenges
For the complex molecule As₂(SO₄)₃, calculate the total number of atoms present.
💡 Hint: Break down the compound into parts, count, and then sum them up.
Determine the total number of atoms in an aqueous solution of C₁₀H₁₈N₂O₄.
💡 Hint: Count through each type carefully; they're all present in the formula!
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.