Where thermodynamic data is provided in the problem, use that information (don\'

Question

Where thermodynamic data is provided in the problem, use that information (don't look it up!). Thermodynamic data not provided should be in Appendix C of your text, unless I have made a horrible mistake (but that never happens!). Read carefully, but don't over-interpret. If you are totally stuck, send me an e-mail! How much heat is absorbed/released when 35.00 g of NH_3(g) reacts in the presence of excess O_2(g) to produce NO(g) and H_2O(l)? For the balanced reaction, delta H= 1168 k J NH_3(g)+ O_2(g)+ H_2O(l) A) 600.1kJ of heat are observed. B) 600.1 kJ of heat are released. C) 2400 kJ of heat are absorbed. D) 2400 kJ of heat are released.

Explanation / Answer

1)

number of moles of NH3,
n = mass/molar mass
= 35.00 g / 17 g/mol
= 2.06 mol

4NH3 + 5O2 ----> 4NO + 6H2O

when 4 mol of NH3 reacts. heat absorbed = 1168 KJ

heat absorbed for 2.06 mol = 1168*2.06 /4 = 601.1 KJ

Answer: A

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