Name Chapter 5 Extra Credit March 2, 2018 J# To earn 15 points of extra credit o

Question

Name Chapter 5 Extra Credit March 2, 2018 J# To earn 15 points of extra credit on your 2"d lowest test you must submit this at the beginning of class on Monday, 3/5/18. If the assignment is not submitted at the start of class it will not be accepted for any reason. You must show your work for each problem to receive any credit. This assignment will be graded. 1 ) The kinetic energy of a 232-g object moving at a speed of 81 .9 km/hr is A) 1900 B) 77.8 C) 145 D) 1.43 x 10-3 E) 6.00 J 2) The specific heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise the temperature of 15 g of lead from 22 °C to 37 °C? A) 2.0J B) -0.13 J C) 5.8 × 10-4 J D) 29 J E) 0.13 J 3) Given the following reactions N2(g) + 202 (g) 2NO2 (g) dH-66.4k/ 2NO (g) + O2 (g) 2NO2 (g) 1--11 4.2 kJ the enthalpy of the reaction of the nitrogen to produce nitric oxide N2 (g) + 02 (g) 2NO (g) kJ. is A) 180.6 B)-47.8 C) 47.8 D) 90.3 E) -180.6

Explanation / Answer

Hess law is used to solve this problem

You need to reverse the second reaction of NO2 to give NO. (this is needed in order to get the final reaction for formation of NO from N2)

So just write it reverse and the sign of the enthalpy changes

Now adding the two reactionsreactions(common reactants on both side get cancelled out to give the third reaction (the one we need )and the enthalpy comes up to 66.4+114.3=180.6

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