STEM 101 - Chemistry Prefinal Exam

What is Avogadro's number?

• 6.02 × 10^23

• 3.14 × 10^12

• 2.99 × 10^8

• 1.23 × 10^20

Which of the following represents the mass of one mole of carbon-12 atoms?

• 12 grams

• 6.02 × 10^23 grams

• 6.02 × 10^23 amu

• 1 gram

A mole of silver contains 6.02 x 1023 __________________?

• Molecules

• Atoms

• Ions

• Formula Units

What is the molar mass of methane (CH₄)?

• 16 g/mol

• 18 g/mol

• 22 g/mol

• 32 g/mol

What is the molar mass of potassium nitrate (KNO₃)?

• 74 g/mol

• 84 g/mol

• 98 g/mol

• 102 g/mol

Compute the molar mass of FeSO4.

• 1.26 g/moles

• 0.8 g/moles

• 256 g/moles

• 152 g/moles

Tags

NGSS.HS-PS1-1

Determine the molar mass of CCl4.

• 153.8 g/mol

• 47.54 g/mol

• 189.35 g/mol

• 82.9 g/mol

What is the molar mass of CO2?

• 44.0 g/mol

• 28.0 g/mol

• 58.45 g/mol

• 6.02 x 1023 g/mol

What is the molar mass of carbon?

• 6.0 g/mol

• 12.0 g/mol

• 22.4 g/mol

• 6.02 x 1023 g/mol

What is the molar mass of water (H₂O)?

• 18 g/mol

• 22 g/mol

• 12 g/mol

• 24 g/mol