[سحر البيان]

المشاركة الأصلية كتبت بواسطة المواعزيه السلام عليكم دكتورة وبنات كيفكم عندي كم سؤال اتمنى احد يوضح لي كم فقرة فيه 5)-the enthalpy of combustion of acetylene c2h2 is c2h2(g) + (5/2)o2(g) → 2co2(g) + h2o(l) ∆h°rxn= -1299 kj calculate the enthalpy of formation of acetylene, given the following enthalpies of formation ∆h°f[co2(g)] = -393.5 kj/mol ∆h°f[h2o(l)] = -285.8 kj/m a) 227 kj/mol b) 227 j/mol c) -228 kj/mol d) 227 j/mo -------------------------------------------------------------------- 8)-hydrogen peroxide (h2o2) decomposes according to the equation h2o2(l) → h2o(l) + ½o2(g ) from the following data calculate kp for this reaction at 25°c ∆h° = –98.2 kj , ∆s° = 70.1 j/k a) 1020 b) 10.2 c) 20.1 d) 102 ----------------------------------------------------------------------- 10)-the element oxygen was prepared by joseph priestley in 1774 by heating mercury(ii) oxide hgo(s) → hg(l) + ½o2(g) ∆h° = 90.84 kj use the data given below to estimate the temperature at which this reaction will become spontaneous under standard state conditions s°(hg) = 76.02 j/k• mol , s°(o2) = 205.0 j/k• mol, s°(hgo) = 70.29 j/k• mol a) 840 k b) 480 k c) 840 c° d) 480 c ---------------------------------------- وشكرا

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