A student forget to read the label on the jar carefully and put potassium chlori

Question

A student forget to read the label on the jar carefully and put potassium chloride in the crucible instead of potassium chlorate. How would the results turn out? What if a potassium chlorate sample is contaminated with KCl. Would the experimental % oxygen be higher or lower than the theoretical % oxygen? Explain your answer. What if a potassium chlorate sample is contaminated with moisture. Would an analysis show the experimental % oxygen higher or lower than the theoretical % oxygen ? Explain Calculate the percentage of Cl in Al(ClO3)3 Other metal chlorates when heated show behavior similar to that of potassium chlorate yielding metal chlorides and oxygen. Write the balanced formula equation for the reaction to be expected when calcium chlorate, Ca(ClO3)2 is heated.

Explanation / Answer

Al(ClO3)3.
Molecular weight (Al) = 27 g/mol
Molecular weight (Cl) = 35.5
Molecular weight (O) = 16
We have one Al, three Cl, and nine O's in Al(ClO3)3, which would give it the molecular mass of 27 + (3 x 35.5) + (9 x 16) = 277.5 g/mol
The amount of chlorine in one mol is 3 x 35.5 = 106.5 g/mol

the percentage of Cl : 106.5/277.5 = 0.3837
0.468 x 100 = 38.4 %

Calcium chlorate is Ca(ClO3)2

So when it decomposes via heating

Ca(ClO3)2(s) ---------> CaCl2(s) + 3O2(g)

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