(A) A 2.4917 g sample of an unknown solid hydrate was heated to drive off all the water of hydration. The remaining solid, which weighed 1.8558 g, was analyzed and found to be 27.74% Mg, 23.57% P, and 48.69% O, by mass. What is the formula and name of the unknown solid hydrate?

(B) An unknown solid hydrate was analyzed and found to be 17.15% Cu, 19.14% Cl, and 60.45% O, by mass; the remainder was hydrogen. What are the oxidation states of copper and chlorine in this compound? What is the name of this compound?