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Chem 125 - Online HW 5 - Question 1(Name:Arshi Imtiaz What...

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Question 1 (Name:Arshi Imtiaz) What is the kinetic energy in joules of an object with a mass of 58.2 grams traveling at 43.2 miles per hour? 0.562 J 10.8 J 24.3 J 21.7 J 5.43 x 10 4 J Question 2 When NO 2 ( g ) reacts with N 2 O( g ), NO( g ) is produced. 156 kJ of heat is absorbed for every mole of NO 2 that reacts. Which reaction below is the correct, balanced thermochemical reaction? NO 2 ( g ) + N 2 O( g )==>NO( g ) ; H = +156 kJ NO 2 ( g ) + N 2 O( g )==>3NO( g ) ; H = +156 kJ NO 2 ( g ) + N 2 O( g )==>3NO( g ) ; H = -468 kJ NO 2 ( g ) + N 2 O( g )==>3NO( g ) ; H = -156 kJ NO 2 ( g ) + N 2 O( g )==>3NO( g ) ; H = +468 kJ Question 3 Given the thermochemical equation: N 2 ( g ) + 3H 2 ( g )==>2NH 3 ( g ) ; H = -92 kJ Which reaction below is the balanced thermochemical equation for the reaction in which eight moles of NH 3 are formed from nitrogen and hydrogen. 4N 2 ( g ) + 12H 2 ( g )==>8NH 3 ( g ) ; H = +368 kJ 8N 2 ( g ) + 24H 2 ( g )==>8NH 3 ( g ) ; H = -736 kJ 4N 2 ( g ) + 12H 2 ( g )==>8NH 3 ( g ) ; H = -92 kJ 4N 2 ( g ) + 12H 2 ( g )==>8NH 3 ( g ) ; H = -368 kJ 4N 2 ( g ) + 12H 2 ( g )==>8NH 3 ( g ) ; H = +92 kJ Question 4 Hydrogen combusts according to the reaction 2H 2 ( g ) + O 2 ( g ) ==> 2H 2 O( g ) ; H = -484 kJ If 1.96 x 10 3 kJ of heat is given off during the reaction, how many grams of oxygen gas were consumed? 6.27 x 10 4 g
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111 g 130. g 64.8 g 113 g 120. g Question 5 When 33.9 grams of a substance absorbs 50.4 J of heat, the temperature of the substance increases from 30.2 o C to 59.0 o C. What is the specific heat of the substance?
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