The Mole and Stoichiometry

Match the following representative particle

• Mg

• Formula Unit

• O₂

• Molecule

• NaCl

• Atom

How many atoms are in 4.3g of H₂? Use correct significant figures!

Mathematical Equivalence

ON

Match the following molar masses

• 58.44 g/mol

• NaCl

• 131.29 g/mol

• (NH₄)₂SO₄

• 132.17 g/mol

• Xe

• 32.07 g/mol

• S

What is the molar mass NaCl?

• 58 grams
• 22.95 grams
• 162 grams
• 6.02 x 10²³

How many atoms are in 1 mole of NaCl? 

• 6.02 x 10²³
• 58 
• 11
• 17

How many moles are in 20 grams of Ca (Calcium)?

• 0.5 
• 1
• 3
• 20

What is the molar mass when you have 4 moles of CO₂?

• 176 grams

• 54 grams

• 128 grams

• 280 grams

What is the difference between the atomic mass of an element and the molar mass of a compound?

• The atomic mass is the added sum of ALL of the elements

• The molar mass can be either the added sum of ALL the masses or the mass of a particular element

• The molar mass and the atomic mass are always the same

• The atomic mass of a compound is the average of H₂O

The mole can be used to measure (SELECT ALL CORRECT ANSWERS)

• The amount of atoms

• The amount of molecules or compounds in a substance

• The amount of particles

• The amount of fission or fusion decay over time

How many atoms are in 1 mole of Iodine (I)?

• 6.022 x 10²³

• 4.022 x 10²³

• 6.022 x 10²⁵

• 4.022 x 10²⁵