Problem Set 3 problemsChem 3321Fall, 2009∆rHo= standard enthalpy of reaction∆fHo= standard enthalpy of formation∆rUo= standard ∆U of the reaction 1.The molar heat capacity of ethane is represented in the temperature range of 298 K to 400 K by the empirical expression Cp,m/(J K-1mol-1) = 14.73 + 0.1272 (T/K). The corresponding expressions for C(s) and H2(g) are of the form Cp,m(J K-1mol-1) = a + bT + c/T2where a, b and c are 16.86, 4.77 and -8.54 for C(s) and 27.28, 3.26, and 0.50 for H2(g). Calculate the standard enthalpy of formation of ethane at 350 K from its value at 298 K.2.The standard enthalpy for formation of the metallocene bis(benzene)chromium was measured in a calorimeter. It was found for the reaction Cr(C6fH6)(s) Cr(s) + 2C6H6(g) that ∆rUo(583 K) = 8.0 kJ/mol. Find the corresponding reaction enthalpy and estimate the standard enthalpy of formation of the coumpound at 583 K. The constant pressure molar heat capacity of benzene is 140 J K-1mol-1in its liquid range and 28 J K-1mol-1as a gas.3.Silylene (SiH
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