Ответы на вопрос:
ar(ba)=137
ar(s)=32
ar(o4)=48
mr(baso4)=137+32+48=207
w(ba)=137: 207=0.66х100=66%
w(s)=0.15x100=15%
w(o4)=100%-(66%+15%)=19%
mr(ca3(po4)2= 120+62+96=278
w(ca3) = 120: 278 = 0.43x100 = 43%
w((p)2) = 62: 278 = 0.22x100 = 22%
w((o4)2) = 100%-65%=35%
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