K 4 of 10 Problem 5.69 M Part A ie Quantities for Selected Write a balanced equa

Question

K 4 of 10 Problem 5.69 M Part A ie Quantities for Selected Write a balanced equation depicting the formation of one mole of NO2(g) from its elements in their standard states Express your answer as a chemical equation. Identify all of the phases in your answer Substances at 298.15 K Substance NO(9) NO (9) N0(9) N 04(9) SO2(9) SO3(9) NaBr(s) NaBr(aq) Pb(NO:)2() 4519 ??? (kJ/mol) 90.37 3384 81.6 9.66 296.9 -395.2 -361.4 360.6 Submit Previous Answers Request Answer Incorrect; Try Again: 4 attempts remaining Pb(NO)(ag) 4213 Part B For NO (9) find the value of AH press vour answer 5:50 PM

Explanation / Answer

A.

Balanced equation,

(1/2) N2 (g) + O2 (g) ------------> NO2 (g)

B. Since enthalpy of formation of elements intheir standard state is 0 kJ/mol,

deltaH0f = 33.84 kJ/mol

C.

S (s) + (3/2) O2 (g) ------------> SO3 (g)

D.

deltaH0f = - 395.2 kJ/mol

E.

Na (s) + (1/2) Br2 (l) ------------> NaBr (s)

F.

deltaH0f = - 361.4 kJ/mol

NOTE :

deltaH0r = [Sum of enthalpies of formation of products - sum of enthalpies of formation of reactants]

And

Enthalpy of formation of elements in their standard state = 0.000 kJ/mol

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