Which of the following statements are false? A) If a chemical equation is multip

Question

Which of the following statements are false? A) If a chemical equation is multiplied by some factor, Delta H degree_rxn is also multiplied by the same factor. B) If a chemical reaction changes direction, then Delta H degree_ rxn changes sign. C) If a chemical equation can be expressed as the sum of a series of steps, Delta H degree_rxn for the overall equation is the sum of the heats of reactions for each step. D) Standard states are all in the gas phase. A motor does 30 kJ of work and loses 4 kJ as heat to the surroundings. What is the change in the internal energy of the motor? A) -34 kJ B) +34 kJ C) -26 kJ D) +26 kJ

Explanation / Answer

5. D, since standard states are also applicable for solids and liquids.

Ex: Delta H0 for graphite in standard state is zero.

6. A/c to I st law of thermodynamics delta E = Q + W

Delta E = 30 + 4 = 34 KJ

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