mP = 43,7% . 142 = 62 (g)
nP = 62/31 = 2 (mol)
mO = 142 - 62 = 80 (g)
nO = 80/16 = 5 (mol)
CTHH: P2O5: điphotpho pentaoxit
\(m_P=\dfrac{142.43,7}{100}=62\left(g\right)\Rightarrow n_P=\dfrac{62}{31}=2\left(mol\right)\)
\(m_O=\dfrac{142.56,3}{100}=80\left(g\right)\Rightarrow n_O=\dfrac{80}{16}=5\left(mol\right)\)
=> CTHH: P2O5