MCAT Question of the Day
    •

    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.



    Molecular Structure | Thermochemistry |
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