Mr(B2O3) = 11*2 + 16*3 =70
W(B2O3) = Ar(O) *n / Mr(B2O3) *100% = 16*3 / 70 *100% =68,6%
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Mr(B2O3) = 11*2 + 16*3 =70
W(B2O3) = Ar(O) *n / Mr(B2O3) *100% = 16*3 / 70 *100% =68,6%