Three laboratory groups claim to have prepared the same binary compound of potassium…

CHEMISTRY · Subjective · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

Three laboratory groups claim to have prepared the same binary compound of potassium and bromine. Their measured element masses are: • Sample 1:

2.93\,\text{g}

K and

6.00\,\text{g}

Br • Sample 2:

5.87\,\text{g}

K and

12.05\,\text{g}

Br • Sample 3:

4.10\,\text{g}

K and

8.20\,\text{g}

Br Identify which sample, if any, fails to satisfy the Law of Definite Proportions and calculate the percent error of its K:Br mass ratio relative to the average ratio of the other two samples.

Related theory

Law of Definite Proportions
Laws of Chemical Combination
Some Basic Concepts of Chemistry

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