Определить массовые доли

K2CO3W% (k2)=K2*100%/K2CO3=39*2*100%/39*2+12+16*3=7800/138=56,5% (K) W% (C)=C*100%/K2CO3=12*100%/39*2+12+16*3=1200/138=8,7% (C) W% (O3)=O3*100%/K2CO3=16*3*100%=39*2+12+16*3=4800/138=34,7% (O3)