Answer:
278.68 g - 293.35 g
Step-by-step explanation:
since they are several trials, to have a trust value, first is necessary the average to know a value of reference.
so you add the 8 quantities and you divide them into 8.
In this case, the average is 293.35 g
Considering this average is the 100 % of the chemical reaction, not all the chemical reactions, react at the 100 %, a trust value could be the 95 % of the value. so..
293.35 g = 100%
x = 95 %
X= (95 % x 293.35 g ) / 100 % = 278.68 g
Hope this info is useful