Question

Trong 25 gam dung dich NaOH 20% co so mol NaOH la

Answer 1

m_NaOH = \(\frac{25.20}{100}=5\left(g\right)\)
=> n_NaOH = \(\frac{5}{40}=0,125\left(mol\right)\)

Answer 2

mNaOH= 25*20/100=5g

nNaOH= 5/40=0.125 mol

Answer 3

mNaOH= 20 . 25 :100=a

n NaOH= a:40=....