Science 9 - Mole Concept

1. It refers to a specific number of particles?

• atom

• mole

• ion

• isotope

2. It simply refers to the sum of the masses of the atoms in the molecule of the substance.

• atomic mass

• formula mass

• molecular mass

• molar mass

3. The mass in grams of one mole of a substance is called ______________.

• atomic mass

• formula mass

• molecular mass

• molar mass

4.Selenium has a 34 protons and 45 neutrons. What is its atomic mass?

• 68 amu

• 79 amu

• 68 g/mol

• 79 g/mol

5. Avogadro's number is equivalent to _______________________.

• 6.02 X 10²³ particles

• 6.02 X 10²² particles

• 6.02 X 10²¹ particles

• 6.02 X 10²⁰ particles

6. Solve for the atomic mass of Carbon dioxide (CO₂).

Carbon = 12.01 amu

Oxygen = 16.00 amu

• 38.01 amu

• 44.01 amu

• 40.02 amu

• 56.02 amu

7. One amu is equivalent to 12 grams of _____________ isotope.

• Carbon-10

• Carbon-11

• Carbon-12

• Carbon-13

8. Formula mass is appropriate to use for ________________.

• metallic compound

• ionic compound

• covalent compound

• isotope compound

9. What unit should be used for molar mass?

• amu

• grams

• g/mol

• atoms

10. What is the molar mass of water (H₂O)?

Hydrogen = 1.01

Oxygen = 16.00

• 18.02 amu

• 33.01 amu

• 18.02 g/mol

• 33.01 g/mol