Molar Conversions Review

Molar Conversions

By Mihir Paranjape

Molar Mass

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​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

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

Molar Mass

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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

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​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​

Fill in the Blank

Find the Molar Mass of C₆H₁₂O₆

Given Atomic Mass of

C = 12.01

H = 1

O=16

Calcualte upto 2 places after decimals.

Fill in the Blank

Find the Molar Mass of Ca(NO₃)₂

Given Atomic Mass of

Ca = 40

N = 14

O=16

Molar Conversions

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​Diving into Moles - Divide

​

Exiting Moles - Multiply​

​

Avogadros Number

6.02 x 10^23​

Fill in the Blank

How many moles are in 91 g of CO₂

Round up two places after decimal

Atomic Mass

C = 12

O = 16

Fill in the Blank

How many g are in 3.4 moles of CO₂

Round up two places after decimal

Atomic Mass

C = 12

O = 16

Fill in the Blank

How many moles are in 45 L of O₂ gas?

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