$\begin{align}  & \left\{ \begin{matrix}   {{m}_{{{H}_{2}}O}}+{{m}_{jive}}=730g  \\   {{V}_{{{H}_{2}}O}}+{{V}_{jive}}=100c{{m}^{3}}  \\\end{matrix}\Rightarrow \left\{ \begin{matrix}   {{\rho }_{{{H}_{2}}O}}{{V}_{{{H}_{2}}O}}+{{\rho }_{jive}}+{{V}_{jive}}=730  \\   {{V}_{jive}}=100-{{V}_{{{H}_{2}}O}}  \\\end{matrix} \right.\Rightarrow 1\times {{V}_{{{H}_{2}}O}}+13/6\times (100-{{V}_{{{H}_{2}}O}})=730 \right. \\  & \Rightarrow 12/6{{V}_{{{H}_{2}}O}}=630\Rightarrow {{V}_{{{H}_{2}}O}}=50c{{m}^{3}}\Rightarrow {{m}_{{{H}_{2}}O}}=\rho V=1\times 50=50g \\ \end{align}$