Масовая часть-

Al3NO3

Ca3 (PO4) 2

Mr (Al3NO3) = 3*27+14+3*16=143

W (Al) = 81/143=0.57=57%

W (N) = 14/143=0.10=10%

W (O) = 48/143=0.33=33%

Mr (Ca3 (PO4) 2) = 3*40+2*31+8*16=310

W (Ca) = 120/310=0.39=39%

W (P) = 62/310=0.20=20%

W (O) = 128/310=0.41=41%