Name:_________________________________________ KEY Date:___________________ Period:__________________ Chem I Stoichiometry WS 4 Reaction Stoichiometry Review #1 1. Given the reaction below, calculate the masses needed for each reactant and product. Show that there is conservation of mass. Br2(l) + 2LiI(aq) ο 2LiBr(aq) + I2(s) M 2(79.9) + 2(6.9+126.9) = 2(6.9+79.9) + 2(126.9) 159.8 + 2(133.8) = 2(86.8) + 253.8 Mass ratio 159.8g + 267.6 g = 173.6 g 427.4 g = 427.4 g + 253.8g 2. Balance the reaction below and calculate the number of moles of iron (III) flouride produced if 10.8 mole of fluorine gas reacts with solid iron. Assume there is enough iron to react with all of the iron. 2Fe(s) + 3F2(g) ο 2FeF3(g) 10.8 πππ πΉ2 π₯ 2 πππ πΉππΉ3 = 7.20 πππ πΉππΉ3 3 πππ πΉ2 3. Determine the number of grams of H2O produced from the reaction of 1500 mol of hydrogen gas with excess oxygen gas. 2H2(g) + O2(g) ο 2H2O(g) 1500 πππ π»2 π₯ 2 πππ π»2 π 18.0 π π»2 π π₯ = 27,000 π π»2 π = 27.0 ππ π»2 π 2 πππ π»2 πππ π»2 π 4. Aluminum carbonate decomposes into aluminum oxide and carbon dioxide. Determine the volume of carbon dioxide, in liters, produced at 1.00 atm of pressure and 25°C if 2.35 g of alumium carbonate is decomposed. __Al2(CO3)3(s) ο __Al2O3(s) + 3CO2(g) Al: 2 x 27.0 = 54.0 g Al C: 3 x 12.0 = 36.0 g C O: 9 x 16.0 =144.0 g O 234.0 g/mol 1 πππ π΄π2 (πΆπ3 )3 2.35 π π΄π2 (πΆπ3 )3 π₯ = 0.0100 πππ π΄π2 (πΆπ3 )3 234.0 π π΄π2 (πΆπ3 )3 3 πππ πΆπ2 0.0100 πππ π΄π2 (πΆπ3 )3 π₯ = 0.0300 πππ πΆπ2 1 πππ π΄π2 (πΆπ3 )3 πΏ ∗ ππ‘π (0.0300 πππ πΆπ2 ) (0.0821 ) (298 πΎ ) ππ π πππ ∗ πΎ π= = π 1.00 ππ‘π = 0.737 πΏ πΆπ2 (Note: what is volume of CO2 @ STP? 0.0300 x 22.4 L/mol = 672 mL) 5. Balance the reaction below and determine volume ratio of carbon monoxide to carbon dioxide. If 42.7 g of CO is reacted completely at STP, what mass in grams and volume in liters of nitrogen gas will be produced? 2CO(g) + 2NO(g) ο __N2(g) + _2CO2(g) M 28.0 28.0 Mass ratio 56.0 28.0 Volume ratio is 2CO: 2 CO2 or 1:1 42.7 g CO x 28.0g N2/56.0g CO = 21.4 g N2 21.4 g N2 x 1 mol N2 28.0 g N2 x 22.4 L mol gas = 17.1 L N2