Factor Label Review & Mole Calculations

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Factor Label Review Mole Calculations
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Factor Label Method

• write down given value
• write unit of given in denominator
• write unit to find in numerator
• insert numerical values
• solve

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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
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Molar Relationships

• Mole as a number of particles
• Molar Mass
• Molar Volume of a Gas

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Mole to Particle Conversions

• 1 mole 6.02x1023 molecules or atoms
• Problem1
• How many molecules are in 1.75 moles of N2?

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Mole to Particle Conversions 2

• 1 mole 6.02x1023 molecules or atoms
• Problem2
• How many moles are in 2.59x1022 molecules of N2?

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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

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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?

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Mole to Mass Conversions 2

• Problem 2
• How many moles if 97.2 g of NaCl?

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2 Step Mole Problems

• Mass ? Moles ? Molecules
• Molecules ? Moles ? Mass
• Gas volumes too!!!
• MOLE ISLAND !!!

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Mole Island
6.02 x 1023
Molar Mass
GasVolume Reef
22.4 Liters