Ответы на вопрос:
Mr(alpo4) = ar(al) + ar(p) + ar(o)*4 = 27+31+(16*4) = 27+31+64 = 112 w(al) = ar(al)\mr(alpo4) *100% = 27\112 * 100% = 30% w(p) = ar(p)\mr(alpo4) * 100% = 31\112*100% = 30% w(o) = ar(o)*4\mr(alpo4) * 100% = 64\112*100%=60%
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