дано
C6H12O6
W(O)-?
M(C6H12O6) = 12*6+1*12+16*6 = 180 g/mol
W(O) = Ar(O)*n / M(C6H12O6) * 100% = 16*6 / 180 *100% = 53.33 %
ответ 53.33 %
