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"How much energy is evolved to convert 36g H2O(g) at 135 degreees C to H2O at -15 degrees C?" My question was previously answered but I don't understand why q5 is negative when the the enthalpy is positive ?
no of moles of water = W/G.M.Wt = 36/18 = 2 moles The steam convert 135°c to 100°C q1 = mc T = 36*1.84(100-135) = -2318.43 =
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• Here we are cooling the water 80 energy get evolved out from system. So According to deberan defination offrap as requiredconuersion process of followed by steps: , H,0-H29, 3) 28 4 oc. Всі Hio C) Выс , -> H20 , H20 и с 2 (0) (Се |ю. CIoo°C) - 1Total heat evolved f q 29, +92 + a +94 +95 12a - 11.935 KS

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