how to calculate percent error
Percent Error Formula = [ (Experimental Value - Theoretical Value) / Theoretical Value ] x 100%
is that an absolute value?
and can the experimental value & theo value be percents?
also how do you find the mole ratio between anhydrous crystals and water
(hydrated crystal lab)
To calculate percent error, you need two values: the experimental or measured value, and the accepted or theoretical value. The percent error allows you to quantify the difference between the measured and theoretical values.
Here's how you can calculate percent error:
1. Determine the experimental or measured value. This is the value you obtain through observation, measurement, or experimentation.
2. Determine the accepted or theoretical value. This value typically comes from a trusted source or a known standard.
3. Subtract the accepted value from the measured value. This difference represents the error between the two values.
Error = Measured Value - Accepted Value
4. Divide the error by the accepted value.
Percent Error = (Error / Accepted Value) x 100
5. Finally, express the result as a percentage by multiplying the calculated value by 100.
Let's take an example to understand this better:
Suppose you conducted an experiment to measure the density of a substance, and the accepted value for its density is 2.5 g/cm^3. You obtained a measured value of 2.3 g/cm^3.
Error = 2.3 g/cm^3 - 2.5 g/cm^3 = -0.2 g/cm^3
(Note: Negative sign indicates that the measured value is lower than the accepted value.)
Percent Error = (|-0.2 g/cm^3| / 2.5 g/cm^3) x 100 = 8%
In this case, the percent error is 8%, indicating that your measured value deviates by 8% from the accepted value.