ࡱ> ?A>} bjbj55 4:__77777KKKKDDK/'777nnn77nnnn, K0n0/nNn7nPn/ : MOLE WORKSHEET NAME: DATE: 1. Determine the mass of a. 2.50 moles of aluminum hydroxide _____________________ b. 0.0125 moles of dinitrogen pentoxide ______________________ c. 3.12 x 1021 formula units of iron (III) sulfide ______________________ d. 4.30 x 1027 molecules of carbon monoxide gas ______________________ 2. Find the number of moles in: a. 1.25 grams of strontium nitrate ______________________ b. 0.570 g of chlorine gas (Cl2) ______________________ 3. How many formula units are in 225 g of lithium oxide? ______________________ 4. How many molecules are in 15.0 g of silicon tetrafluoride? ______________________ ** How many atoms of fluorine are in 15.0 g of silicon tetrafluoride? ______________________ 5. Find the percent composition (by mass) of nickel (II) hydroxide. % Ni = _____ % O = _____ % H = _____ a. Use your answer to #5 to the determine the mass of nickel in 45.0 g of nickel (II) hydroxide. _______________ b. Use your answer to #5 to determine the mass of nickel (II) hydroxide that contains 10.0 g of nickel. _______________ 6. Find the percent composition (by mass) of nitric acid. % N = _____ % O = _____ % H = _____ a. What mass of nitric acid contains 12.0 g of nitrogen? _______________ 7. Find the molecular formula of a compound if its empirical formula is CH2O and its molar mass is 90 g/mol. ________________ MOLE WORKSHEET NAME: DATE: 1. Determine the mass of a. 2.50 moles of aluminum hydroxide _____________________ Al(OH)3 = 27 + (3 x 16) + (3 x 1) = 78 g/mol 2.50mol x 78 g = 195 g 1 mol b. 0.0125 moles of dinitrogen pentoxide ______________________ N2O5 = (2 x 14) + (5 x 16) = 108 g/mol 0.0125mol x 108 g = 1.35 g 1 mol c. 3.12 x 1021 formula units of iron (III) sulfide ______________________ Fe2S3 = (2 x 55.8) + (3 x 32.1) = 207.9 g/mol 3.12 x 1021 fu x 1 mol x 207.9 g = 1.08 g 6.02 x 1023 fu 1 mol d. 4.30 x 1027 molecules of carbon monoxide gas ______________________ CO = 12 + 16 = 28 g/mol 4.30 x 1027 molecules x 1 mol x 28 g = 200,000 g 6.02 x 1023 molecules 1 mol 2. Find the number of moles in: a. 1.25 grams of strontium nitrate ______________________ Sr(NO3)2 = 87.6 + (2 x 14) + (6 x 16) = 211.6 g/mol 1.25 g x 1 mol = 0.00591 mol 211.6 g b. 0.570 g of chlorine gas (Cl2) ______________________ Cl2 = 2 x 35.5 = 71.0 g/mol 0.57 g x 1 mol = 0.00803 mol 71 g 3. How many formula units are in 225 g of lithium oxide? ______________________ Li2O = (2 x 6.9) + 16 = 29.8 g/mol 225 g x 1 mol x 6.02 x 1023 fu = 4.55 x 1024 fu 29.8 g 1 mol 4. How many molecules are in 15.0 g of silicon tetrafluoride? ______________________ SiF4 = 28.1 + (4 x 19) = 104.1 g/mol 15.0 g x 1 mol x 6.02 x 1023 molecules = 8.67 x 1022 molecules 104.1 g 1 mol ** How many atoms of fluorine are in 15.0 g of silicon tetrafluoride? ______________________ 4 F atoms per molecule of SiF4, therefore 4 x 8.67 x 1022 = 3.47 x 1023 5. Find the percent composition (by mass) of nickel (II) hydroxide. % Ni = _____ Ni(OH)2 = 58.7 + (2 x 16) + (2 x 1) = 92.7 g/mol % Ni = 58.7/92.7 x 100% = 63.3% % O = _____ % O = 32/92.7 x 100% = 34.5% % H = 2/92.7 x 100% = 2.2% % H = _____ a. Use your answer to #5 to the determine the mass of nickel in 45.0 g of nickel (II) hydroxide. 45.0 g x (63.3/100) = 28.5 g _______________ b. Use your answer to #5 to determine the mass of nickel (II) hydroxide that contains 10.0 g of nickel. 10/X = 63.3/100, so X = (100 x 10)/63.3 = 15.8 g _______________ 6. Find the percent composition (by mass) of nitric acid. % N = _____ HNO3 = 1 + 14 + (3x16) = 63 g/mol % H = 1/63 x 100% = 1.6 % % O = _____ % N = 14/63 x 100% = 22.2% % O = 48/63 x 100% = 76.2% % H = _____ a. What mass of nitric acid contains 12.0 g of nitrogen? 12/X = 14/63, so X = (12 x 63)/14 = 54 g _______________ 7. Find the molecular formula of a compound if its empirical formula is CH2O and its molar mass is 90 g/mol. CH2O = 12 + (2 x 1) + 16 = 30 g/mol 90/30 = 3, so empirical formula x 3 + molecular formula =m so MF = C3H6O3 ________________ 3 5 v  X n o s 0 u e  "7K]^vx~rjh.B*phh7h7B*H*phh7h7B*phh hhjh]hjhj5CJ\h5CJ\h]5CJ\h5CJ\hh5H*hh5hhH*hh5\hhH* hhhh5CJ\))*+E ! 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