2. Barium sulfate, BaSO4, is not very soluble in water. However, you can force it to dissolve by adding acid: BaSO4 (s) + HCl (aq)  Ba2+ (aq) + HSO4- (aq) + Cl- (aq)
Suppose you have 100.0 g of BaSO4 in a beaker, and you slowly add 500.0 mL of 0.200 M aqueous HCl, mixing well. Will all the BaSO4 dissolve?

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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explanation:

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mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b