Which of the following statements statement about internal energy E. is fable? a

Question

Which of the following statements statement about internal energy E. is fable? a. Its absolves value cambium be determined b. In some processes delta E = q + w c. Delta E is positive in relation d. It represents all the energy with is a certain amount of e. In some processes Delta E = q Given the following potential energy diagram for the one-step reaction X + Y rightarrow Z + R The arrow "C" represents the ___ a. activation energy for the forward reaction b. activation energy for the reverse reaction c. net energy of reaction for the reverse reaction d. activation energy for the forward reaction e. energy content for the reaction The gas-phase reaction 2NO + 2 H_2 N_2 + 2 H_2 O has the following rate low expression rate = 0.14 L^2/mol^2 s [NO] [H_2]. If the [NO] is 0.95 M and the [H_2] is 0.45 M, what rate is expected? a. 0.057 mol/L _5 b. 1.54 mol/L s c. 0.43 mol/L 5 d. 0.060 mol/L s e. 0.027 mol/L s

Explanation / Answer

(1)

Statement (c) is false, because in an exothermic reaction, heat is given out by the reaction, so dE is negative.

(2)

Activation energy for the reverse reaction: ( Z + R ---> X + Y ) is represented by the arrow 'c'.

(3)

Putting values in the rate equation, we get:

r = 0.14*0.952*0.45 = 0.0568 or 0.057 mol/(L.s)

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