m(H2SO4)в 1-ом р-ре =300*0,2=60г;
m(H2SO4)в 2-ом р-ре =200*0,185=37г;
m(H2SO4)общая =60+37=97г;
m(р-ра)общая =300+200=500г;
W(H2SO4)после смешивания =97/500=0,194(19,4%).
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