\(m_K=\dfrac{55,2.212}{100}=117\left(g\right)=>n_K=\dfrac{117}{39}=3\left(mol\right)\)
\(m_P=\dfrac{14,6.212}{100}=31\left(g\right)=>n_P=\dfrac{31}{31}=1\left(mol\right)\)
\(m_O=\dfrac{30,1.212}{100}=64\left(g\right)=>n_O=\dfrac{64}{16}=4\left(mol\right)\)
=> CTHH: K3PO4