MCAT Question of the Day
    •

    Q:

    		 A liquid compound, X3 undergoes two separate reactions in a lab experiment. In reaction A, the molecule first decomposes to its elemental form (simply X, which is a solid), and then heat is applied such that the X atoms reform to create X3 gas. In reaction B, heat is applied to liquid X3 and gaseous X3 is produced. Which of the following is true for these reactions?
    		 

    A

    		 Change in enthalpy for both reaction A and B is zero.

    B

    		 Change in enthalpy is the greater for reaction A compared with reaction B.

    C

    		 Change in enthalpy is the less for reaction A compared with reaction B.

    D

    		 Change in enthalpy is the same and nonzero for reaction A and reaction B.



    Thermochemistry |
    Subscribe


    Is Your Score Stuck?

    We can teach you how to crush the MCAT!

    Learn More