Answer:
<h3>The answer is 0.91 %</h3>
Explanation:
The percentage error of a certain measurement can be found by using the formula

From the question
actual volume = 198.2 mL
error = 200 - 198.2 = 1.8
So we have

We have the final answer as
<h3>0.91 %</h3>
Hope this helps you
It's the number of Protons of that atom..
All of them are compounds.