What is the molar solubility of silver sulfate (Ag₂SO₄) in water? The solubility-product constant for Ag₂SO₄ is 1.5×10⁻⁵ at 25°C.
a) 2.7×10⁻¹² mol/L
b) 6.5×10⁻⁴ mol/L
c) 5.5×10⁻³ mol/L
d) 1.6×10⁻² mol/L