Given the following two reactions at 298 K and 1 atm, which of the statements is

Question

Given the following two reactions at 298 K and 1 atm, which of the statements is true? N_2(g) + O_2(g) rightarrow 2NO(g) Delta H_1 NO(g) + 1/2 O_2(g) rightarrow NO_2(g) Delta H_2 Delta H for NO_2(g) = Delta H_2 + 1/2 Delta H_1 Delta H for NO_2(g) = Delta H_2 Delta H_f degree = Delta H_2 Delta_f degree for NO(g) = Delta H_1 none of these For which of the following reaction(s) is the enthalpy change for the reaction equal to Delta H_f degree of the product? H_2(g) rightarrow 2 H(g) H_2(g) + O_2(g) rightarrow H_2O_2(l) H_2O(l) + O(g) rightarrow H_2O_2(l) II I and II I III I and III

Explanation / Answer

35]

Answer is A

Delta H0f for NO2(g) = delta H2 + 1/2 delta H1

36]

Answer is E that is I and III

For I

delta H = delta Hf (H2) - 2 X delta Hf (H)

= 0 - 2 X delta Hf (H)

= -2 X delta Hf(H)

for II

= delta Hf (H2O2) - [delta Hf(H2) + delta Hf(O2) ]

= delta Hf(H2O2) - [ 0+ 0 ]

= delta Hf(H2O2)

for III

= delta Hf (H2O2) - [delta Hf(H2O) + delta Hf(O) ]

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