ok Im a little confused please help. Hanging on the wall of the REACTOR laborato

Question

ok Im a little confused please help.

Hanging on the wall of the REACTOR laboratory is a periodic chart. Click on it to open it up. Find the elements K, Cl and O, and click on each one to find their atomic weights. Use these to calculate a theoretical mass percent of oxygen in KClO? according to:

theoretical mass percent of oxygen = (mass of 3 oxygen atoms) / (mass of KClO?)*100

Atomic weight of K = 39.0983
Atomic weight of CI = 35.453
Atomic weight of O = 15.9994

Got the atomic weights above now let me know if this is right: 15.9994 * 3 = 47.9982 + 39.0983 +35.453 =122.5495
so the answer i thought was 47.9982 * 100 = 4799.82 / 122.5495 = 39.166% for
theoretical mass percent of oxygen = (mass of 3 oxygen atoms) / (mass of KClO?)*100

and if I'm right than what do i do with the next question below?


Calculate the percent error in the experiment using the experimental and theoretical values of the mass percent of oxygen. The percent error is defined as:

|(experimental value) - (theoretical value)| / theoretical value * 100%

Explanation / Answer

1) mass of 3 oxygen atoms = 15.9994 times 3 2) mass of KClO3 = 39.0983 + 35.453 + (15.9994 times 3) then, follow the instruction you gave for calculating the mass percent. The instructions you give for percent error calculation are correct. Simply use your experimental value and, for the theoretical value, use the value you calculate using the above numbers from 1 and 2.

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