$C{a}_3{P}_2+H_{2}O\to A\uparrow +B$
Weight (in grams) of black compound obtained when 2 moles of ‘A’ reacts with 3 moles of $CuS{O}_4$  is:
(Given that: GAW of Cu = 63.5, P =31, S = 32, H = 1, O = 32)