كل مايخص كيمياء 202

[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
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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

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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
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وشكرا

[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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