Question

Assignment Score: 233/2000 Resources Hint Check Answer Question 14 of 20 Cryolite, Na, AIF (S), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation for the synthesis of cryolite. equation: A1,0,(s) + NaOH(1) + HF(g) Na AIF + H2O(g) If 16.4 kg of AI,O,(s), 59.4 kg of NaOH(1), and 59.4 kg of HF(g) react completely, how many kilograms of cryolite w be produced? mass of cryolite produced: kg Na Which reactants will be in excess? ALO, OHF NaOH What is the total mass of the excess reactants left over after the reaction is complete?

Answer 1

Balanced equation is:

Al₂O₃(s) + 6 NaOH (l) + 12 HF (g) → 2 Na₃AlF₆(s) + 9 H₂O (g)

moles Al2O3 = 16400 g / 101.96128 g/mol = 160.84537189 mol

moles NaOH = 59400 g / 39.99711 g/mol = 1485.107299 mol

moles HF = 59400 g / 20.006343 g/mol = 2969.05836314 mol

Al₂O₃ is limiting reactant here

moles Na₃AlF₆ = 2 x 160.84537189 mol = 321.69074378 mol

mass of cryolite produced = 321.69074378 mol x 209.9412656 = 67.5361618811 kg ~ 67.5 kg

excess reactants are = NaOH & HF

Excess moles of NaOH = 1485.107299 - ( 6 x 160.84537189 ) = 520.03506766 mol

mass of excess NaOH = 520.03506766 mol x 39.99711 g/mol = 20.8 kg

Excess moles of HF = 2969.05836314 - ( 12 x 160.84537189 ) = 1038.91390046 mol

mass of excess HF = 1038.91390046 mol x 20.006343 g/mol = 20.8 kg

Total mass of excess reactant left over = 20.8 + 20.8 = 41.6 kg

Assignment Score: Give Up? Hint 233/2000 Resources Check Answer < Question 14 of 20 Cryolite, Na AlF,(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation for the synthesis of cryolite. equation: Al203 (s)+6 NaOH (1)+ 12 HF (g) 2 Na3AIF6 (s) + 9 H20 (g) If 16.4 kg of Al,0,(s), 59.4 kg of NaOH(), and 59.4 kg of HF(g) react completely, how many kilograms of cryolite w be produced? 67.5 kg Na mass of cryolite produced Which reactants will be in excess? HF Both NAOH & HF are 41.6 kg NaOH What is the total mass of the excess reactants left over after the reaction is complete?

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