7. Given the following equations and DHo values, determine the heat of reaction (kJ) at 298 K for the reaction:
PCl3(g) + Cl2(g) à PCl5(g)
2 P(s) + 3 Cl2(g) à 2 PCl3(g) DHo/kJ = -542
2 P(s) + 5 Cl2(g) à 2 PCl5(g) DHo/kJ = -764
8. 4.90g of of ammonium iron (II)sulfate hexahydrate, FeSO4(NH4)2SO4*6H2O, was dissolved in 200.mL of acidified water. 20.0mL of the solution reacted completely with 12.6mL of potassium manganate (VII) (KMnO4) solution according to the balanced equation below. Calculate the concentration of the potassium manganate (VII) solution
5Fe2+ + MnO4- + 8H+ à 5Fe3+ + Mn2+ + 4H2O
2007-11-18
23:33:21
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2 answers
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asked by
stylinpat
2