chemistry

Identify the true statement(s) regarding the entropy of chemical substances.

a. All pure substances have a positive entropy at room temperature.
b. The dissolution of an ionic salt in water usually leads to an increase in entropy of the system (salt + water).
c. So(one mole O3(g)) > So(one mole O2(g)) at 25oC.
d. The entropy of ice at 0oC is lower than that of water at 0oC.
e. When a metallic crystal is heated, its entropy increases due to increasing atomic vibrations.

i know a, c and d are true, but im not sure about b and e

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  1. I think all of the statements are true.

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  2. Identify the true statement(s) regarding the entropy of chemical substances.

    a. Two moles of a substance at temperature T and pressure p has twice the entropy of one mole of the same substance at the same temperature and pressure.
    b. Precipitation reactions are typically associated with a decrease in entropy.
    c. So(one mole N2O4(g)) > So(one mole NO2(g)) at 25oC.
    d. The entropy change for the reaction N2O4(g) ® 2 NO2(g) is positive.
    e. Entropy increases when a 1 L cylinder of gas is opened within a 5 L evacuated cylinder.

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  3. c,d

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  4. abde

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