Molar Conversions Review

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​

Molar Mass Calculations

Some text here about the topic of discussion

Element​	​# atoms	​Atomic Mass	​Molar Mass
​C	​	​	​
H​	​	​	​
​Total	​	​	​

Molar Mass

Some text here about the topic of discussion

If atoms are inside parenthesis, simply multiply the number inside by number outside. e.g.

(CH₃COOH)_3​

​Element	​number inside	​Number out	​Total
​C	​1	​3	​1x3 = 3
​H	​3+1=4	3​	​4x3 = 12
​O	​1+1=2	3​	​2x3 = 6

Molar Mass Calculations

Some text here about the topic of discussion

​Element	​# Atoms	​Atomic Mass	​Molar Mass
​Pb	​1	​207.2	​207.2
​C	2x4=8​	12​	96​
​H	3x4=12​	1​	12​
​O	2x4=8​	16​	128​
​Total	​	​	443.2​

Molar Conversions

Some text here about the topic of discussion

​Diving into Moles - Divide

​

Exiting Moles - Multiply​

​

Avogadros Number

6.02 x 10^23​

Multiple Choice

How many L are in 5.6 moles of N2 gas?

• 125.44

• 22.4

• 0.25

• 5.6

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

Multiple Choice

How many L are in 64 g of O2 at STP?

Hint: First convert g - moles

then moles-L

• 2

• 44.8

• 11.2

• 22.4

Multiple Choice

How many g are in 56 L of O₂ at STP?

• 1.75

• 80

• 56

• 22.4

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 molecules are in 11.2 L of O₂ at STP?

• 0.5

• 2

• 3.01 x 10²³

• 6.02 x 10²³

Multiple Choice

How many molecules are in 1 mole of O₂ at STP?

• 0.5

• 2

• 3.01 x 10²³

• 6.02 x 10²³

Multiple Choice

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

• 8

• 128

• 0.25

• 4