A mixture containing FeCI3(molar mass=162.21g/mol) and AICI3(molar mass=133.35g/mol) weighs 5.95g. The chlorides are converted to the?

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2020-12-06 2:15 pm

hydrous oxides and ignited to Fe2O3(molar mass=159.69g/mol). AI2O3(molar mass=101.96g/mol). The oxide mixture weighs 2.62 g. Calculate the % Fe(atomic mass=55.85g/mol) and % AI(atomic mass=26.98g/mol)in the original mixture.

回答 (1)

Uncle Michael

2020-12-07 1:05 am

✔ 最佳答案

Let x g be the mass of Fe in the mixture, and y g be the mass of Al in the mixture.

Mass of the mixture of chlorides:
x * (162.21/55.85) + y * (133.35/26.98) = 5.95
2.9044x + 4.9426y = 5.95 …… [1]

Mass of the mixture of oxides:
x * [159.69 / (55.85 * 2)] + y * [101.96 / (26.98 * 2)] = 2.62
1.4296x + 1.8995y = 2.62 …… [2]

1.4296*[1] - 2.9044*[2]:
1.5490y = 0.89659
y = 0.579

4.9426*[2] - 1.8995*[1]:
1.5490x = 1.6476
x = 1.064

% Fe in the original mixture = (1.064/5.95) × 100% = 17.9%
% Al in the original mixture = (0.579/5.95) × 100% = 9.73%

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