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Chapter 8 Problem Answers 8.1 Step 1: Determine the H for the reaction, taking into consideration that 1.81 mol of Si reacted. x =−−−−,, , -- - - .× . =− . ×, - .. . 6 8 7 1 8 1 124103 Step 2: Detemine E from the equation E= H+P V (Watch your units!) ± ± =,, . .,− . .= −−−. 05 22 4 12 ×,, , , , -- .×, ,, , -- -,, -- . .- .×,,, , -− .,, - .- 11 2 0 3 2 5 ∙ 21 103 31 4.=−−. - .,, , ,, -- .-,, -- . .= . - .. = . . . 113 10 3 2 2 3103 113 ¨ =, − . - .. . . −, 1 24 10 3 . . .= 1 13 1 23 8.2 For an exothermic reaction, the amount of heat released by the reaction equals the amount of heat gained by the calorimeter plus the amount of heat gained by the solution. Determine the amount of heat gained by the solution by first calculating the mass of the solution. ×,, . .− 100 102 ××. ,, -- 4184 .×, 26 65 23 35 .= = 1410 Step 1: Determine the amount of heat gained by the calorimeter.

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