A solution has $25\%$ w/w solution of Sodium Chloride in 10 grams of water what is the mole fraction of Sodium Chloride?

Question

$\begin{array}{1 1} (a)\; 0.05 \\ (b) \;0.06 \\ (c) \;0.07 \\ (d) \;0.08 \end{array}$