Вычислите mr вещества и определите w каждого элемента в нем 1. of2 2.B2O3 3. H3BO3
M(OF2)=16+38=54g/mol wO=16/54*100%=29.6% wF=100%-29.6%=70.4% M(B2O3)=22+48=70g/mol wB=22/70*100%=31.4% wO=100-31.4=68.6% M(H3BO3)=3+11+48=62g/mol wH=3/62*100%=4.8% wB=11/62*100%=17.74% wO=100-4.8-17.74=77.46%