Ответы на вопрос:
Дано cuso4 nacl h2so4 naoh m(cuso4)=63.5+32+64=159.5g/mol w(cu)=63.5/159.5*100=39.81% w(s)=32/159.5*100%=20.06% w(o)=4*16/159.5*100%=40.13% m(nacl)=23+35.5=58.5g/mol w(na)=23/58.5*100%=39.32% w(cl)=100%-39.32%=60.68% m(h2so4)=1*2+32+64=98g/mol w(h2)=1*2/98*100%=2.04% w(s)=32/98*100%=32.65% w(o)=4*16/98*100%=65.31% m(naoh)=23+16+1=40g/mol w(na)=23/40*100%=57.5% w(o)=16/40*100%=40% w(h)=1/40*100%=2.5%
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