A student reported the following composition of an unknown mixture, 25% NH4Cl, 30% NaCl, and 50% SiO2. Assuming the student's calculations are correct, explain the error.

Question

Mateo Mejia

Chemistry

22 March, 10:15

A student reported the following composition of an unknown mixture, 25% NH4Cl, 30% NaCl, and 50% SiO2. Assuming the student's calculations are correct, explain the error.

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Lizbeth Garcia · Answer 1

The three substances add up to 105% instead of 100%. Also, the amount of either one of those compounds is more than according to the Stoichiometry of the reaction, meaning one of those compounds is in excess.