J.R. S. answered 09/07/23
Ph.D. University Professor with 10+ years Tutoring Experience
Let's first find the volume of the liquid that was added:
35.9 g x 1 ml / 0.865 g = 41.50 mls
Next, we can find the volume of the insoluble solid:
84.0 mls - 41.50 mls = 42.5 mls
Finally, we can calculate the mass of the solid:
42.5 mls x 2.50 g / ml = 106 g (3 sig.figs.)