The first paragraph makes sense but there is no question. I can't decipher the second paragraph. If the second paragraph is supposed to give information to calculate the concn of naphthalene, then what you want is
Psolution = Xhexane*Pohexane
Calculate the vapor pressure at 25 C of hexane above the solution. The vapor pressure of pure hexane at 25 C is 151 torr.
A solution contains naphthalene ({\rm{C}}_{10} {\rm{H}}_8) dissolved in hexane ({\rm{C}}_6 {\rm{H}}_{14}) at a concentration of 12.17 \% naphthalene by mass.
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