\(m_{Fe}=\dfrac{48,28.116}{100}=56\left(g\right)\Rightarrow n_{Fe}=\dfrac{56}{56}=1\left(mol\right)\)
\(m_C=\dfrac{10,34.116}{100}=12\left(g\right)\Rightarrow n_C=\dfrac{12}{12}=1\left(mol\right)\)
\(m_O=116-56-12=48\left(g\right)\Rightarrow n_O=\dfrac{48}{16}=3\left(mol\right)\)
=> CTHH: FeCO3