Molar Mass Conversions

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Presentation transcript:

Molar Mass Conversions 10.2 1 mol of Fe atoms is 55.85 g/mol How many grams in 2 mol Fe? or 3 mol Fe? or 0.0587 mol Fe?

Use molar mass to convert between mass and moles. (get MM from the PT) Type 3 mol grams 2.5 mol x 16.00 g = ______ g 1 mol Type 4 grams mol 24.02 g x 1 mol = _____ mol 12.01 g

Type 3 mol grams 9.45 mol x 101.96 g = 1 mol 963 g 2 (26.98) + 3 (16.00) = 101.96 g/mol

Find the mass, in grams, of 0.0452 mol C20H42. Type 3 mol grams 0.0452 mol x 282.62 g = 1 mol 12.8 g 20 (12.01) + 42 (1.01) = 282.62 g/mol

Type 4 grams mol 92.2 g x 1 mol = 159.7 g 0.577 mol Rust weakens an iron chain. 2 (55.85) + 3 (16.00) = 159.7 g/mol

B3O Find the number of moles in 258 g triboron monoxide. Type 4 grams mol 258 g x 1 mol = 48.43 g 5.33 mol 3 (10.81) + 1 (16.00) = 48.43 g/mol

Quick Quiz! 1. Where do you look to get the molar mass of an element? Avogadro’s number the periodic table your neighbor’s paper your face

Quick Quiz. 2. Calculate the mass in grams of a sample containing 1.85 mol of water. 1.11 x 1024 g 33.3 g 18.02 g 8460 g

Quick Quiz. 3. Calculate the number of moles in a spoonful of table salt (NaCl) having a mass of 3.50 g. 208 mol 2.58  103 mol 0.0599 mol 17.0 mol