Nov '12
15
MCAT Question of the Day | MCAT Course


  • Q:

    A brand of rock salt is rated down to -25 °C. The salt is indicated to be mostly composed of NaCl. Exposed to temperatures of -35 °C the salt ceases to work. If the NaCl rock salt were replaced with CaCl2 with the same molality, would the ice melt?

     

    A

    No, because the salts are placed in the same molality.

    B

    No, because the additional melting power of the CaCl2 would be insufficient to melt ice at -35 °C.

    C

    Yes, because the CaCl2 would be able to melt ice down to -37.5 °C.

    D

    Yes, because melting of CaCl2 is exothermic.




    Tags: Molecular Structure | Thermochemistry | Suggest a tag
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