Ответ:
Объяснение:
Mr(Mn2O7) = 55*2 + 16*7 = 222
W(O) = Ar(O) *n / Mr(Mn2O7) *100% = 16*7 / 222 *100% =50%
Mr(Al(OH)3 = 27 + 16*3 + 1*3 = 78
W(O) = Ar(O) *n / Mr(Al(OH)3) *100% = 16*3 / 78 *100% = 61%
Mr(CaHPO4) = 40 + 1 + 31 + 16*4 = 136
W(O) = Ar(O) *n / Mr(CaHPO4) *100% = 16*4 / 136 *100% = 47%
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Ответ:
Объяснение:
Mr(Mn2O7) = 55*2 + 16*7 = 222
W(O) = Ar(O) *n / Mr(Mn2O7) *100% = 16*7 / 222 *100% =50%
Mr(Al(OH)3 = 27 + 16*3 + 1*3 = 78
W(O) = Ar(O) *n / Mr(Al(OH)3) *100% = 16*3 / 78 *100% = 61%
Mr(CaHPO4) = 40 + 1 + 31 + 16*4 = 136
W(O) = Ar(O) *n / Mr(CaHPO4) *100% = 16*4 / 136 *100% = 47%