Molar Mass! Chapter Ten Chemistry Mrs. Luckett
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Molar Mass It equals how many grams are in one mole of an element or compound Examples: Element: Na molar mass is grams Compound: NO molar mass is 30 grams Use the subscript numbers to get your total H 2 O = H is x 2 = O is x 1 = Molar mass =
Calculating molar mass with parentheses When there are parentheses you have to multiply the subscript number on the outside by the subscript on the inside. Example: Mg(NO 3 ) 2 Mg = 1 x grams = N = (2 x 1) x14 grams = 28 O = (3 x 2) x 16 grams = 96 Total = ____ grams
Practice Problems What is the molar mass of the following compounds? 1) FeO 2) Li 3 PO 4 3) P(NO 2 ) 3
Single Step Conversions Luckett Chemistry
Conversion factors You need to create two conversion factors for each equal quantity 1 moleORmolar mass molar mass1 mole 1 moleOR22.4 L 22.4 L1 mole 1 mole 6.02 x particles 6.02 x particles1 mole Example: what are the two conversion factors for the molar mass of LiNO 3 ?
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Converting moles to mass and mass to moles To convert moles to mass you have to multiply by the molar mass _____ moles x molar mass 1 mole To convert mass to moles you have to divide by the molar mass _____ grams x 1 mole molar mass
Practice Problems Knowing the molar mass convert the following mole quantities to grams. 1) 0.98 moles FeO 2) 234 grams Li 3 PO 4 3) 7.56 moles P(NO 2 ) 3
Converting Particles to Moles and Moles to Particles To convert moles to the number of particles you have to multiply by avogadro’s number _____ moles x 6.02 x particles 1 mole To convert the number of particles to moles you have to divide by avogadro’s number _____ particles x 1 mole 6.02 x particles
Practice Problems Convert between moles and particles moles FeO 2.34 x particles Li 3 PO moles P(NO 2 ) 3
Converting Volume to Moles and Moles to Volume To convert moles to volume you have to multiply by 22.4 L _____ moles x 22.4 L 1 mole To convert volume to moles you have to divide by 22.4 L _____ Liters x 1 mole 22.4 L
Practice Problems 1) Convert the following mole quantities to Liters. 2) 0.98 moles FeO 3) 234 Liters Li 3 PO 4 4) 7.56 moles P(NO 2 ) 3