Дано
mppa(C17H33COOH)=250 g
W=25%
KOH
-----------------------------------------
m(C17H33COOK)-?
находим массу вещества олеиновой к-ты
m(C17H33COOH)=250*25%/100%=62.5 g
62.5g Xg
C17H33COOH+KOH-->C17H33COOK+H2O
282 320
M(C17H33COOH)=282g/mol
M(C17H33COOK)= 320 g/mol
62.5/282 = X/320
X=70.92 g
ответ 70.92 г