Pb(SO₄)₂:
A. The answer is Lead(IV) Sulfate.
That is the name of Pb(SO₄)₂ is Lead(IV) Sulfate.
B.
mass of lead = 207.2 g
mass of sulfur = 2 × 32.065 g = 64.13 g
mass of oxygen = 8 × 16 = 128 g
total mass of Pb(SO₄)₂ = (207.2 + 64.13 + 128 )
= 399.33 g
molar mass of Pb(SO₄)₂=399.33 g/mol