Ответы
Ответ:
Объяснение:
№ речовина w₁ w₂
1 Cr2O3 59,32 40,68
2 Mn2O7 49,55 50,45
3 Р2О5 45,07 54,93
Mr(Cr2O3)= Ar(Cr) * 2 + Ar(O) * 3 = 35 * 2 + 16 * 3 = 118
w(Cr) = Ar(Cr) * n / Mr(Cr2O3) * 100% = 35 * 2/118 * 100% = 59,32%
w(О) = Ar(О) * n / Mr(Cr2O3) * 100% = 16 * 3/118 * 100% = 40,68%
Mr(Mn2O7)= Ar(Mn) * 2 + Ar(O) * 7 = 55 * 2 + 16 * 7 = 222
w(Mn) = Ar(Mn) * n / Mr(Mn2O7) * 100% = 55 * 2/222 * 100% = 49,55%
w(О) = Ar(О) * n / Mr(Mn2O7) * 100% = 16 * 7/222 * 100% = 50,45%
Mr(P2O5)= Ar(P) * 2 + Ar(O) * 5 = 31 * 2 + 16 * 5 = 142
w(P) = Ar(P) * n / Mr(P2O5) * 100% = 31 * 2/142 * 100% = 45,07%
w(О) = Ar(О) * n / Mr(P2O5) * 100% = 16 * 5/142 * 100% = 54,93%