Homework Help: Chemistry

Posted by mZ. YoU on Saturday, February 17, 2007 at 11:28am.

How do you find Absolute error and how do you find relative error?

Absolute error is the difference between the experimental value and the actual value. Relative error, usually expressed as a percent, is the error relative to the correct value. For example,
ABSOLUTE ERROR:
We perform an analysis on a sample for Na. We find 34.0%. We turn in the results and the instructor tell us she made the samples and they were 36.0% Na. Absolute error is x_exp - x_true = 34.0-36.0= -2.0%.

RELATIVE ERROR:
Same values as above.
relative error = [(34.0-36.0)/36.0]x100=5.56%

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