212
Объяснение:
Ar(K3) + Ar(P) + Ar(O4) = 117 + 31 + 64 = 212
Молекулярная масса
Mr(K3 PO4) = 39 * 3 + 31 + 16 * 4 = 212
W(K)= n(K) * Ar(K) * 100% / Mr(K3 PO4) = 3 * 39 * 100% / 212 = 55,188%
W(P) = n(P) * Ar(P) * 100% / Mr(K3 PO4) = 1 * 31 *100% / 212 = 14,622%
W(O) = n(O) * Ar(O) * 100% / Mr(K3 PO4) = 4 * 16 * 100% / 212 = 30,188%
