# Moles Gizmo Quiz Answer Key

## Introduction

Are you a student who recently took the Moles Gizmo quiz? Are you struggling to find the correct answers? Look no further, as we have compiled the answer key for you in this article.

## What is the Moles Gizmo quiz?

The Moles Gizmo quiz is an online assessment that tests a student's knowledge on moles and their calculations. This quiz is typically taken in chemistry classes and is a crucial part of understanding the subject.

1. What is a mole?
Answer: A mole is a unit of measurement used in chemistry to express amounts of a chemical substance. 2. How many atoms are in one mole of a substance?
Answer: One mole of a substance contains 6.02 x 10^23 atoms. 3. What is Avogadro's number?
Answer: Avogadro's number is 6.02 x 10^23. 4. How do you calculate the number of moles in a substance?
Answer: The number of moles in a substance is calculated by dividing the mass of the substance by its molar mass. 5. What is the molar mass of water?
Answer: The molar mass of water is 18.015 g/mol. 6. How many moles are in 25 grams of NaCl?
Answer: There are 0.427 moles in 25 grams of NaCl. 7. What is the empirical formula of C4H8O2?
Answer: The empirical formula of C4H8O2 is CHO. 8. How do you calculate the percent composition of a substance?
Answer: The percent composition of a substance is calculated by dividing the mass of each element in the compound by the total mass of the compound and multiplying by 100%. 9. What is the molecular formula of a compound?
Answer: The molecular formula of a compound is the actual number of atoms of each element in a molecule. 10. How do you calculate the molarity of a solution?
Answer: The molarity of a solution is calculated by dividing the number of moles of solute by the volume of the solution in liters.

## Conclusion

We hope this answer key has helped you understand the Moles Gizmo quiz better. Remember, practice makes perfect, so keep practicing those mole calculations. Good luck!

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