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ID: 1088775 • Letter: X
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x 3 six types of chemical ref × New Tab is/view.phpid 4744363 Sweling Learning Le Login-UnveriyotGoogle Translate Gmal sobegobte HomeChe.comBnk of Ac Bank of Americe N Netfl arning Jump to... Gradebook 2/25/2018 11.55 PM 28.2/100 2/19/2018 09:25 AM Due University Science Books Cryolite, NayAFs), an ore used in the prodaction of aluminum, can be synthesized using aluminum axide. Balance the equation. Tip: If you need to clear your work and reset the equuation bultion that looks Point ike two red arrows r 11.8 klograms of NOs), 584 kilograms of NaOH), and 58.4 kilograms of HF(g) react completely, how many kilograms of aryolite will be produced? Descr You c kg Na,AIF Which reactants will be in excess? What is the total mats of she excess reactants left over ater the reaction is complete? You c You lo NaOH HF 1168 For m o eTex 3 4 5 6 7 8 9Explanation / Answer
Balance equation is
Al2O3 + 6 NaOH + 12 HF = 2 Na3AlF6 + 9 H2O.
in this reaction one mole Al2O3 react with 6 mole NaOH and 12 mole HF to produce 2 mole Na3AlF6 and 9 mole H2O.
11.8 kg Al2O3 = mass / molar mass = 11.8 / 101.96 = 0.116 kmole.
58.4 Kg NaOH = 58.4 / 40 = 1.46 kmole.
58.4 kg HF = 58.4 / 20.01 = 2.92 kmole.
Al2O3 is the limiting reactant.
Kg of cryolite producedd = 0.116 * 2 = 0.232 kmole = 0.232 * 209.94 = 48.7 Kg
excess reactants are HF and NaOH.
excess NaOH = 1.46 - (0.116 * 6) = 0.764 kmole = 0.764 * 40 = 30.56 kg.
excess HF = 2.92 - (0.116 * 12) =1.528 kmole = 1.528 * 20.01 = 30.57 kg.
so total mass of excess reactant left over = (30.56 + 30.57) = 61.13 Kg
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