You need to konw the density of acetone (propanone)
The use the equation
density = mass / volume
d = m/v
m = dv
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To find the volume of 10 grams of acetone, you use the fact that the density of acetone is 0.7857 grams per cubic centimeter. The density formula is given as mass divided by volume, or m/V. The volume is mass/density or 10/0.7857, which is equal to 12.73 cubic centimeter.
80 - 75 = 5 grams.
The mass is 295 grams. This is multiplication and subtraction. 9 x 238 = 2142 grams for the balls Total - ball mass = box mass 2437 - 2142 = 295 grams
500 grams
I would guess 250 grams.