molar mass

Molar Conversions

By Mihir Paranjape

Molar Mass

Some text here about the topic of discussion

​Mass of 1 mole of substance.

Units: g/mole

Tabulate all elements

Count number of atoms

Find Atomic Mass of each atom from Periodic Table

Multiply the number of atoms by Atomic Mass

Add all the individual numbers to find Molar Mass​

Multiple Choice

What is the mass of one mole of aluminum?

• 27 g
• 13 g
• 54 g
• 14 g

Multiple Choice

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

Multiple Choice

Calculate the molar mass of water (H₂O).

• 10 g/mol

• 17 g/mol

• 18 g/mol

• 34 g/mol

Multiple Choice

Find the molar masses of the following compounds:

NaBr

• 303.3 g/mole

• 102.9 g/mole

• 74.1 g/mole

• 160.0 g/mole

• 96.0 g/mole

Multiple Choice

Find the molar masses of the following compounds:

(NH₄)₂CO₃

• 303.3 g/mole

• 102.9 g/mole

• 74.1 g/mole

• 160.0 g/mole

• 96.0 g/mole

Multiple Choice

Find the molar masses of the following compounds:

Ca(OH)₂

• 303.3 g/mole

• 102.9 g/mole

• 74.1 g/mole

• 160.0 g/mole

• 96.0 g/mole

​

What is the mass of 4.25 moles of CO

​

The molar mass of CO is 28 g/mole​

​4.25 moles CO

​1 mole CO

​28 g

​= 119 grams

Multiple Choice

How many moles would make up a sample of 14.8 grams of NaBr?

• 0.14 mol

• 1,522.77 mol

• 1,522.77 g

• 6.95 g

​1 mole of any element contains 6.02 x 10²³ atoms

​

How many atoms are in 1.25 moles of carbon?​

​

​1.25 moles C

​1 mole carbon

​6.02 x 10²³ atoms

​= 7.52 x 10²³ atoms

​How many moles are in 2.25 x 10²⁴ atoms of Na?

​2.25 x 10²⁴ atoms

​6.02 x 10²³ atoms

​1 mole Na

​= 3.73 moles NA

Multiple Choice

How many moles are in 2.408 x 10²⁴ molecules of O₂?

• 2.408

• 4

• 0.25

• 1

Multiple Choice

How many atoms are in 6 moles of Fe? Find the closest answer

• 3.6 x 10²⁴

• 1 x 10²³

• 134.4

• 6 x 10²⁴

​I can go from grams of a substance to atoms/molecules of a substance....But I must go through moles first!

​How many atoms of carbon are in 4.25 g of carbon?

​4.25 g C

​12 g C

​1 mole C

​1 mole C

​6.02 x 10^23 atoms C

​= 2.13 x 10^23 atoms C

Multiple Choice

How many molecules are in 64 g of O₂?

• 2

• 1.204 x 10²⁴

• 3.01 x 10²³

• 6.02 x 10²³

Multiple Choice

How many g would be occupied by 1.505 x 10²³ Molecules of O₂?

• 8

• 128

• 0.25

• 4