Factor Label Review & Mole Calculations

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# Factor Label Review & Mole Calculations - PowerPoint PPT Presentation

Factor Label Review & Mole Calculations. Factor Label Method. write down given value write unit of given in denominator write unit to find in numerator insert numerical values solve. Factor Label Example. How many hours are in 3.75 years? ( Known: 1 year = 365.25 days 1 day = 24 hours ).

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## Factor Label Review & Mole Calculations

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### Factor Label Review &Mole Calculations

Factor Label Method

write down given value

write unit of given in denominator

write unit to find in numerator

insert numerical values

solve

Factor Label Example
• How many hours are in 3.75 years?

( Known: 1 year = 365.25 days 1 day = 24 hours )

Step 1: set up problem by inserting units

Step 2: insert numerical values and calculate

Molar Relationships

Mole as a number of particles

Molar Mass

Molar Volume of a Gas

Mole to Particle Conversions
• 1 mole = 6.02x1023 molecules or atoms

Problem1 :

How many molecules are in 1.75 moles of N2?

Mole to Particle Conversions #2
• 1 mole = 6.02x1023 molecules or atoms

Problem2 :

How many moles are in 2.59x1022 molecules of N2?

Molar Mass

Molar Mass = mass of 1 mole of a substance

• Elements: atomic mass in units of grams

Na = 23.0 grams Cl = 35.5 grams

• Compounds: sum of individual masses in grams

NaCl = 58.5 grams CaCl2 = 111.1 grams

Mole to Mass Conversions
• 1 mole = X grams of element/substance
• 1 mole NaCl = 58.5 g

Problem 1:

How many grams are in 2.38 moles of NaCl?

Mole to Mass Conversions #2

Problem 2:

How many moles if 97.2 g of NaCl?

1

2 Step Mole Problems
• Mass → Moles → Molecules
• Molecules → Moles → Mass
• Gas volumes too!!!

MOLE ISLAND !!!

Mole Island

6.02 x 1023

Molar Mass

GasVolume

Reef

22.4 Liters