Вычислите содержание (в %) каждого элемента в соединениях, формулы которых:а) СаSO4, 2H2O, б)KNO3 в)NH4K2PO4

w = [latex] \frac{Ar*n}{Mr} [/latex] * 100%  а) Mr(CaSO4) =136  w(Ca) = [latex] \frac{40}{136} [/latex] * 100% = 29,41% w(S) = [latex] \frac{32}{136} [/latex] * 100% = 23,53% w(O) = [latex] \frac{16*4}{136} [/latex] * 100% = 47,06% 2H2O Mr(H2O) = 18  w(H) = [latex] \frac{1*2}{18} [/latex] * 100% = 11,11% w(O) = [latex] \frac{16}{18} [/latex] * 100% = 88,89%  б) KNO3 Mr(KNO3) = 101 w(K) = [latex] \frac{39}{101} [/latex] * 100% = 38,6%  w(N) = [latex] \frac{14}{101} [/latex] * 100% = 13,9%  w(O) = [latex] \frac{16*3}{101} [/latex] * 100% = 47,5%  в) NH4K2PO4 Mr(NH4K2PO4) = 191 w(N) = [latex] \frac{14}{191} [/latex] * 100% = 7,3% w(H) = [latex] \frac{1*4}{191} [/latex] * 100% = 2,1% w(K) = [latex] \frac{39*2}{191} [/latex] * 100% = 40,8% w(P) = [latex] \frac{31}{191} [/latex] * 100% = 16,2% w(O) = [latex] \frac{16*4}{191} [/latex] * 100% = 33,5%