а)Mr(FeO)=56+16=72
ω(Fe)=56÷72=0,778 ω%(Fe)=0,778×100%=77,8%
ω(O)=16÷72=0,222 ω%(O)=0,222×100%=22,2%
б)Mr(P₂O₅)=31x2+16x5=62+80=142
ω(P)=62÷142=0,437 ω%(P)=0,437×100%=43,7%
ω(O)=80÷142=0,563 ω%(O)=0,563×100%=56,3%
Mr(Na₂CO₃)=23x2+12+16x3=46+12+48=106
ω(Na)=46÷106=0,434 ω%(Na)=0,434×100%=43,4%
ω(C)=12÷106=0,113 ω%(C)=0,113×100%=11,3%
ω(O)=48÷106=0,453 ω%(O)=0,452×100%=45,3%
Mr[AI₂(SO₄)₃=54+96+192=342
ω(AI)=54÷342=0,158 ω%(AI)=0,158×100%=15,8%
ω(S)=96÷342=0,281 ω%(S)=0,281×100%=28,1%
ω(O)=192÷342=0,561 ω%(O)=0,561×100%=56,1%
Объяснение:
Mr(FeO) = 56+16=72
W(Fe) = Ar(Fe) *n / Mr(FeO) *100% = 56 *1 / 72 *100% =78%
W(O) = Ar(O) *n / Mr(FeO) *100% = 16*1 / 72 *100% =22%
Mr(P2O5) = 31*2 + 16*5 = 142
W(P) = Ar(P)*n / Mr(P2O5) *100% = 31*2 / 142 *100%=44%
W(O) = Ar(O) *n / Mr(P2O5) *100% = 16*5 / 142 *100% = 56%
Mr(Na2CO3) = 23*2 + 12 + 16*3 = 106
W(Na) = Ar(Nа) *n / Mr(Na2CO3) *100% = 23*2 / 106 *100% = 43%
W(C) = Ar(C) *n / Mr(Na2CO3) *100% = 12*1 / 106 *100% = 11%
W(O) = Ar(O) *n / Mr(Na2CO3) *100% = 16*3 / 106 *100% =46%
Mr(Al2(SO4)3) = 27*2 + 32*3 + 16*12 = 342
W(Al) = Ar(Al) *n / Mr(Al2(SO4)3 *100% = 27*2 / 342 *100% = 16%
W(S) = Ar(S) *n / Mr(Al2(SO4)3 *100% = 32*3 / 342 *100% = 28%
W(O) = Ar(O) * n / Mr(Al2(SO4)3 *100% = 16*12 / 342 *100% = 56%