Question

mn giúp em vs

Answer 1

n P2O5 = 28,4/142 = 0,2(mol

P2O5 + 3H2O $\to$ 2H3PO4

Theo PTHH :

n H3PO4 = 2n P2O5 = 0,4(mol)

CM H3PO4 = 0,4/2 = 0,2M

Answer 2

ta có mP2O5=28.4g =>nP2O5=\(\dfrac{28.4}{142}\)=0.2mol

CM=\(\dfrac{0.2}{2}\)=0.1M