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Hydrogenation reactions are used to add hydrogen …
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Eugene S.
University of Minnesota - Twin Cities

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Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10 Problem 11 Problem 12 Problem 13 Problem 14 Problem 15 Problem 16 Problem 17 Problem 18 Problem 19 Problem 20 Problem 21 Problem 22 Problem 23 Problem 24 Problem 25 Problem 26 Problem 27 Problem 28 Problem 29 Problem 30 Problem 31 Problem 32 Problem 33 Problem 34 Problem 35 Problem 36 Problem 37 Problem 38 Problem 39 Problem 40 Problem 41 Problem 42 Problem 43 Problem 44 Problem 45 Problem 46 Problem 47 Problem 48 Problem 49 Problem 50 Problem 51 Problem 52 Problem 52 Problem 53 Problem 55 Problem 56 Problem 57 Problem 58 Problem 59 Problem 60 Problem 61 Problem 62 Problem 63 Problem 64 Problem 65 Problem 66 Problem 67 Problem 68 Problem 69 Problem 70 Problem 71 Problem 72 Problem 73 Problem 74 Problem 75 Problem 76 Problem 77 Problem 78 Problem 79 Problem 80 Problem 81 Problem 82 Problem 83 Problem 84 Problem 85 Problem 86 Problem 87 Problem 88 Problem 89 Problem 90 Problem 91 Problem 92 Problem 93 Problem 94 Problem 95 Problem 96 Problem 97 Problem 98 Problem 99 Problem 100 Problem 101 Problem 102 Problem 103 Problem 104 Problem 105 Problem 106 Problem 107 Problem 108 Problem 109 Problem 110 Problem 111 Problem 112 Problem 113 Problem 114 Problem 115 Problem 116 Problem 117 Problem 118 Problem 119 Problem 120 Problem 121 Problem 122 Problem 123 Problem 124 Problem 125 Problem 126 Problem 127 Problem 128 Problem 129 Problem 130 Problem 131 Problem 132 Problem 133 Problem 134 Problem 135 Problem 136 Problem 137 Problem 138 Problem 139 Problem 140 Problem 141 Problem 142 Problem 143 Problem 144 Problem 145 Problem 146 Problem 147 Problem 148

Problem 76 Hard Difficulty

Calculate Hrxn for the reaction:

Use the following reactions and given H values:

Answer

$$
-205.7 \mathrm{kJ}
$$

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Video Transcript

So in this problem, we are given the reaction ch for gas plus for C L to gas form's CCL for gas plus for HCL gas, and we want to determine the Delta h of reaction. And so to do this, we're given the reactions. See solid plus two h two gas form C H for gas with adult age of negative seventy four point six. Killer Jules Ah, we're also giving the reactions solid carbon plus two C l to gas form's CCL for gas with a Delta H of negative ninety five point seven. Kill it, Jules. And then finally were given that h two gas plus C l to gas forms to hcl gas with the Delta H negative ninety two point three. Kill it, Jules. And so what we're going to do is combine these three equations such that they add up to our equation of interest. And so I'LL begin with this on the next page for the first equation, we're going to flip it and then flip the delta H so that it is positive instead of negative. And so that equation becomes ch for gas form's solid carbon plus two age to gas and the Delta H becomes seventy four point six. Killer Jules Positive. And so, with the second equation, we can just leave it as it is so solid. Carbon plus two seal to gas form's CCL for gas. And we keep our delta H as it is Negative ninety five point seven. Kill it, Jules. And then for our third equation Ah, we don't need to reverse it, but we do need to double it. And so will write to H two gas plus two C l to gas forms for HCL gas. And then we'll also double the delta h so it becomes negative. One eighty four point six Killa Jules. And so now we can add all these up r to h two's will cancel and are solid carbons were canceled. And so we end up with ch for gas. We end up with four C l too, because we have two times two and then that forms CCL for gas plus for HCL gas. And so this is our equation of interest. And so now we can just add up our delta h is. And when we do this, we get negative two o five point seven killa jewels and that will be our final answer

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