(Solved): A solution was made by mixing sodium chloride ( \( \mathrm{NaCl}) \) and water ( \( \mathrm{H}_{2} ...

A solution was made by mixing sodium chloride ( \( \mathrm{NaCl}) \) and water ( \( \mathrm{H}_{2} \mathrm{O} \) ). Given that the mole fraction of water is \( 0.972 \) in the solution obtained from \( 67.9 \mathrm{~g} \) \( \mathrm{H}_{2} \mathrm{O} \), calculate the mass of sodium chloride used. Mass \( =\quad \mathrm{g} \) A solution was prepared by mixing benzene ( \( \mathrm{C}_{6} \mathrm{H}_{6} \) ) and carbon tetrachloride ( \( \left.\mathrm{CCl}_{4}\right) \). Given that the mole fraction of carbon tetrachloride is \( 0.922 \) in the solution obtained from \( 6.65 \mathrm{~mol} \) \( \mathrm{CCl}_{4} \), calculate the moles of benzene used. mol