Ответы на вопрос:
Mr(so3)=32+3*16=80 w(s)=32/80=0.4=40% w(o)=48/80=0.6=60% mr(h2o)=2*1+16=18 w(h)=2/18=0.112=11.2% w(o)=16/18=0.888=88.8% mr(no2)=14+2*16=46 w(n)=14/46=0.305=30.5% w(o)=32/46=0.695=69.5% mr(caco3)=40+12+3*16=100 w(ca)=40/100=0.4=40% w(c)=12/100=0.12=12% w(o)=48/100=0.48=48% mr(na2so4)=2*14+32+4*16=124 w(na)=28/124=0.225=22.5% w(s)=32/124=0.258=25.8% w(o)=64/124=0.517=51.7%
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