Factor Label Review & Mole Calculations. Factor Label Method 1.write down given value 2.write unit of given in denominator 3.write unit to find in numerator.

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Presentation transcript:

Factor Label Review & Mole Calculations

Factor Label Method 1.write down given value 2.write unit of given in denominator 3.write unit to find in numerator 4.insert numerical values 5.solve

Factor Label Example How many hours are in 3.75 years? ( Known: 1 year = days1 day = 24 hours ) Step 2: insert numerical values and calculate Step 1: set up problem by inserting units

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

Mole to Particle Conversions 1 mole = 6.02x10 23 molecules or atoms Problem1 : How many molecules are in 1.75 moles of N 2 ?

Mole to Particle Conversions #2 1 mole = 6.02x10 23 molecules or atoms Problem2 : How many moles are in 2.59x10 22 molecules of N 2 ?

Molar Mass Molar Mass = mass of 1 mole of a substance Elements: atomic mass in units of grams Elements: atomic mass in units of grams Na = 23.0 gramsCl = 35.5 grams Compounds: sum of individual masses in grams Compounds: sum of individual masses in grams NaCl = 58.5 gramsCaCl 2 = grams

Mole to Mass Conversions 1 mole = X grams of element/substance 1 mole NaCl = 58.5 g 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 Molar Mass 6.02 x Liters Gas Volume Reef