Mole Conversions Review

Mole & Molar Mass Conversions

Mole

• 6.022x10^23 atoms

• molar mass of atom/molecules

Molar Mass

• molar mass = 1 mole

• CO₂

• C=12 O=16x2

• 44 g/mol

Multiple Choice

Molar Mass of CH₄

• 12 g/mol

• 16 g/mol

• 4 g/mol

Multiple Choice

What is the molar mass of Sr(NO₃)₂?

• 211.64 g/mol

• 163.64 g/mol

• 149.63 g/mol

• 197.63 g/mol

Mass converted to molar mass

to find the moles of any molecule

mole = mass/molar mass

20 grams of H₂O is how many moles?

Molar mass of H₂O = 18

Moles = 20/18

1.1 moles of H₂O

Multiple Choice

What is the mass of 0.89 mol of CaCl₂?

• 111 grams

• 0.008 grams

• 98.9 grams

• none of the choices

Multiple Choice

Calculate the moles in 12.7g of CaF₂

• 0.20 mol

• 1,000.76 mol

• 6.14 mol

• 0.16 mol

Multiple Choice

How many moles are in 100.0 g of dinitrogen oxide (N₂O)?

• 2.272 mol N₂O

• 6.25 mol N₂O

• 7.14 mol N₂O

• 44.013 mol N₂O

Multiple Choice

How many grams are in 2.40 mol of sulfur?

• 9.35 x 10^-3 g

• 77.0 g

• 616 g

• 0.0748 g

Avogadro's Number

A mole of something means 6.02x10²³ of that something.

So a mole of pick up trucks is 6.02x10²³ pick up trucks

Multiple Choice

The number 6.02 x 10²³ is called...

• Molar number

• Bohr's number
• Scientist's number

• Avogadro's number

Multiple Choice

When comparing a mole of oxygen and a mole of sulfur, how many atoms does each have?

• oxygen has 16 grams of atoms

• sulfur has 32.06 grams of atoms

• both contains 6.02 x 10²³ atoms

• can not be determined

Multiple Choice

How many molecules are in 27.5 grams of NaOH

• 41.4 molecules

• 4.14 x 10²³ molecules

• 4.14 x 10²⁵ molecules

• 1.83 x 10^-21 molecules

Multiple Choice

How many moles are in 3.01 x 10²² atoms of magnesium, Mg?

• 0.05 moles

• 1.81 X 10⁴⁶ moles

• 5.00 x 10²¹ moles

• 5 moles

Multiple Choice

How many atoms are in 6.5 moles of zinc, Zn?

• 4.2 atoms

• 3.91 X 10^-24 atoms

• 3.91 x 10²⁴ atoms

• 5 x 10²⁴ atoms