Moles: Introduction to Stoichiometry

In chemistry, a "mole" is:

• The mass of an atom
• a large number used to count particles
• based on the volume of a substance

How many potatoes are in one dozen potatoes?

• 10
• 12
• 2
• 6.02 x 10²³

How many atoms of iodine are in a mole of iodine?

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

The number 6.02 x 10²³ is called...

• Obama's number
• Bohr's number
• Trump's number
• Avogadro's number

We use the periodic table to calculate...

• mass
• molar mass
• moles

What is the molar mass of NaCl?

• 58.45g/mol
• 28g/mol
• 12g/mol
• 6.02 x 10²³

What is the molar mass of C₂H₄O₂?

• 40g
• 50g
• 60g
• 68g

How do we get mass from moles?

• multiply by avogadro's number
• multiply by molar mass
• divide by avogadro's number
• divide by molar mass

What would be the mass of 1.5mol H₂O

• 20
• 27
• 32
• 40

What is the mass of 0.75 moles of (NH₄)₃PO₄?

• 101.75 g
• 121.75 g
• 111.75 g
• 131.75 g