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Name Date _ cone. Per Mole to Grams, Grams to Moles Conversions Worksheet To find moles divide molar mass To find grams multiply molarmass What are the molecular weights of the following compounds? NaOH 34.9415 2 HPO, ~ 4 AF 4) Mn2Se; ~ 6) (NH,),S0, ~ fed} There are three definitions (equalities) of mole. They are: 1 mole = 6.02 x 10° particles 1 mole = molar mass (could be atomic mass from periodic table or molecular mass) 1 mole = 22.4 L of a gas at STP Each definition can be written as a set of tvo conversion factors. They are: + 1 mole = molar mass(g) can be written as ___imole OR molar mass (¢) molar mass (g) 1 mole i mole = 6.02 x 16” particles can be written as 1 mole OR 6.02 x 107 6.02 x 10% 1Tmole Solve the following: qy How many moles are in 15 grams of lithium? (molar mags of lithiuga is 7 ¢/orole) 1S geatfis x dimol = 2.14 moles Bthium OR (5e/7g = 2.f4moles) 7 spate 2) Hew many grams are in 2.4 moles of sulfur? (molar mass of sulfur is 32 ¢/ moie) 2.4 mots x 32 grams = 76.8 grams sulfur OK 2.4moles x 32 g = 77 ¢ 3) 4) How many grams are in $8.1 moles of magnesium? a " . 5) 6) oo) Solve the following: 9) 1) i4) 15) g How many moles are in 9.8 grams of calcium? How many grams are in 4.5 moles of sodium fluoride. NaF? {molar mass of NaF is 23 + 19 = 42 ¢/ mole) 4.5 mtheg x 42. = 189 grams NaF OR How many moles 4.5 moles x 32: ¢ in 98.3 grams of aluminum hydroxide, Al(QOH)3? Gmolar mass of AK.OH)3 is 27 + (3 x 16) + (3 x 1) = 78 g/ mole) 98.3 geertfic x _= 1.26 moles AVOH), OR How many grams are in 3.3 moles of potassium sulfide, K2S? e How many grams are in 2.3 x 10% moles of calcium phosp hate, Fat (98.3g/78g = 1.26 moles} ) How many molecules are there in 2.3 grams of NHSO2? 11) How many molecules are there in 200 grams of CC]y? 12) How many grams are there in 1 x 10° molecules of BCI3? 13) How many i4) | How many molecules are there in 9.34 grams of LiCl? cee ven 15) How many 
