H2SO4+2NaOH---->Na2SO4+2H2O
n H2SO4=0,2.1=0,2(mol)
Theo pthh
n NaOH=2n H2SO4=0,4(mol)
m NaOH=0,4.40=16(g)
m dd NaOH 20%=\(\frac{16.100}{20}=80\left(g\right)\)
Ta có :
nH2SO4 = 0,2 (mol)
PTHH: 2NaOH+H2SO4--->Na2SO4+H2O
=>nNaOH=2nH2SO4 =0,2.2=0,4(mol)
=>mNaOH=0,4.40=16(g)
=> mdd NaOH=80g