Lesson Check - The Mole and Avogadro's Number (2025-2026)

How many formula units are in 2.5 mol of NaCl?

• 1.51x10²⁴

• 146
• 4.15
• 1.5x10²⁴

What is the mass of 0.89 mol of CaCl₂?

• 99 grams

• 0.008 grams
• 98.9 grams
• none of the choices

How many water molecules are in 5.2 moles of water?

• 6.0 x 10²³ molecules

• 5.2 molecules

• 3.1 x 10²⁴ molecules

• 8.6 x 10^-24 molecules

How many moles are in 16.94 g of water? (hint: do you know the formula for water?)

• 16.94 moles

• 0.9401 mole

• 305.2 moles

• 1.063 moles

To convert atoms to moles you

Tags

NGSS.HS-PS1-7

to convert grams to moles you...

How many grams are in 1.2 moles of neon?

• 0.059 grams

• 7.2 x 10²³ grams

• 2.0 x 10^-24 grams

• 24 grams

What is the molar mass of the diatomic gas fluorine?
(beware!)

• 18.998 g/mol
• 38 g/mol
• 9 g/mol
• 18 g/mol

Which is a diatomic element?

• Cl

How many atoms are in 9.44 moles of Al?

• 5.68 atomsAl

• 5.68x10²⁴ atoms Al

• 0.705 atoms Al

• 1.25x10²³ atoms Al