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Download Molar Mass and Conversions Notes
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Name:__________________________________ Date:____________ Per:____ Molar Mass Assignment Example showing how to find molar Mass: Example and steps: Ca(OH)2 Step 1: Identify the different elements in the given compound and the number of moles for each one. (remember to distribute if you have parenthesis) 1 mol Ca x 2 mol O x 2 mol H x 40.078 = 40.078 15.999 = 31.998 1.0079 = 2.0158 74.0918 g/mol Step 2: Multiply the number of atoms of each element by that element’s atomic mass. (Round the masses to the nearest hundredth—2 numbers after the decimal) Step 3: Add all multiplied amounts and place the proper unit (grams per mole – g/mol) Determine the molar mass of each of the following compounds. Round your answers to the nearest hundredth and provide the proper units. 1.) C4H10 2.) Al2(SO4)3 4_ mol C x 12.011__ g = _________g/mol ___Al x ____ g = ______g/mol 10_mol H x 1.0079___g = _________g/mol ___S x _____g = ______g/mol Answer = ___O x _____g = ______g/mol Add all for answer = _______g/mol 3.) Li2CO3 4) Ba(OH)2 5) Al(NO3)3 6) CaCl2 Name:__________________________________ Date:____________ Per:____ Molar Mass Assignment Example showing how to find molar Mass: Example and steps: Ca(OH)2 Step 1: Identify the different elements in the given compound and the number of moles for each one. (remember to distribute if you have parenthesis) 1 mol Ca x 2 mol O x 2 mol H x 40.078 = 40.078 15.999 = 31.998 1.0079 = 2.0158 74.0918 g/mol Step 2: Multiply the number of atoms of each element by that element’s atomic mass. (Round the masses to the nearest hundredth—2 numbers after the decimal) Step 3: Add all multiplied amounts and place the proper unit (grams per mole – g/mol) Determine the molar mass of each of the following compounds. Round your answers to the nearest hundredth and provide the proper units. 1.) C4H10 2.) Al2(SO4)3 4_ mol C x 12.011__ g = _________g/mol ___Al x ____ g = ______g/mol 10_mol H x 1.0079___g = _________g/mol ___S x _____g = ______g/mol Answer = ___O x _____g = ______g/mol Add all for answer = _______g/mol 3.) Li2CO3 4) Ba(OH)2 5) Al(NO3)3 6) CaCl2
