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\(n_{CO_2}=\dfrac{11}{44}=0,25\left(mol\right)=n_C\Rightarrow m_C=0,25.12=3\left(g\right)\)

\(n_{H_2O}=\dfrac{9}{18}=0,5\left(mol\right)\Rightarrow n_H=1\left(mol\right)\Rightarrow m_H=1\left(g\right)\)

\(\Rightarrow m_{hh}=m_C+m_h=3+1=4\left(g\right)=m\)