We’re being asked to calculate the molality of ClF_{3} given its solubility in mass percent.

**Mass** or **weight percent (% by mass) **is the percentage of a given element or compound within a solution.

The equation used to calculate for mass percent is shown below:

$\overline{){\mathbf{m}}{\mathbf{a}}{\mathbf{s}}{\mathbf{s}}{\mathbf{}}{\mathbf{p}}{\mathbf{e}}{\mathbf{r}}{\mathbf{c}}{\mathbf{e}}{\mathbf{n}}{\mathbf{t}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{m}\mathbf{p}\mathbf{o}\mathbf{n}\mathbf{e}\mathbf{n}\mathbf{t}}{\mathbf{t}\mathbf{o}\mathbf{t}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}{\mathbf{\times}}{\mathbf{100}}}$

Fluorocarbons (compounds that contain both carbon and fluorine) were, until recently, used as refrigerants. The compounds listed in the following table are all gases at 25 ^{o}C, and their solubilities in water at 25 ^{o}C and 1 atm fluorocarbon pressure are given as mass percentages.

Fluorocarbon | Solubility (mass %) |

CF_{4} | 0.0015 |

CClF_{3} | 0.009 |

CCl_{2}F_{2} | 0.028 |

CHClF_{2} | 0.30 |

For CClF_{3}, calculate the molality of a saturated solution.

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