1) m (NaOH)=W(раствора)*m(раствора)
m (NaOH)=0.25*120г=30г
2) n (NaOH) = m (NaOH)/M(NaOH)
M(NaOH) = 23+16+1=40г/моль
n (NaOH) = 30г/40г/моль=0,75моль
3) n (NaOH) =n(CH3COOH)=0,75моль
4)m (CH3COOH) = M (CH3COOH)*n(CH3COOH)
M (CH3COOH) = 12+1*3+12+16+16+1=60г/моль
m (CH3COOH) = 60 г/моль*0,75моль = 45 г