Why is oxygen written with a subscript 2 in CO2?
2 answers:
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Explanation:
The graphite anodes are suspended into the brine. During electrolysis, Cl ions are oxidized at the anode and chlorine gas goes out of the cell, while sodium ions are reduced at the mercury cathode forming sodium amalgam. ... Hydrogen gas is obtained as a by–product at the cathode.
Answer: The mass percentage of is 5.86%
Explanation:
To calculate the mass percentage of in the sample it is necessary to know the mass of the solute (
in this case), and the mass of the solution (pesticide sample, whose mass is explicit in the letter of the problem).
To calculate the mass of the solute, we must take the mass of the precipitate. We can establish a relation between the mass of
and
using the stoichiometry of the compounds:
Since for every mole of Tl in there are two moles of Tl in
, we have:
Using the molar mass of we have:
Finally, we can use the mass percentage formula: