Answer:
%error = 0.32%
Explanation:
Let's answer both questions, by parts.
1. Percentage error:
In this case, I do not have the video, but I do have the reported melting point of naphtalene which is 80.26 °C.
The expression to calculate the percentage error is the following:
%Error = absolute error / actual percentage. (1)
And the absolute error is:
Abs error = actual value - experimental value (2)
But the experimental value is a range, so we just have to get a average of that:
Exp value = 77 + 83 / 2 = 80 °C
Now the absolute error:
Abs error = 80.26 - 80 = 0.26 °C
Finally the %error:
%error = (0.26 / 80.26) * 100
<h2>
%error = 0.32%</h2>
2. Meaning of melting point range and %error
The melting point range just means that the sample of naphtalene has impurities, and when a sample of any compound has impurities, melting point tends to be low. However, this decrease of temperature is a wider range. But usually a range of just 5° C means that compound has little traces of impurities but it can still be used for reactions.
The %error means that the impurities of the sample are really low, so the sample is practically pure with little traces of impurities.
