Explain the mathematical sign for the energy change

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Reference no: EM13533939

What would be the mathematical sign for the energy change (positive for endothermic or negative for exothermic) for each of the following processes? Explain the reasoning for each choice:

a. Solid dry ice sublimes at room temperature (about 22.0 ºC).

b. Two hydrogen atoms combine to make a hydrogen molecule.

c. Molten (liquid) sodium cools to form solid sodium.

d. Burning of gasoline in a car engine.

Reference no: EM13533939

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