a) For each process, predict the sign of delta S for the system: decomposition o
ID: 513782 • Letter: A
Question
a) For each process, predict the sign of delta S for the system: decomposition of CaCO_2(s) to give CaO(s) and CO_2(g) _________ heating bromine vapor from 45 degree C to 80 degree C _______ condensation of water vapor on a cold surface ________ reaction of NH_3(g) and HCl(g) to give NH_4Cl_(s) ________ dissolution of sugar in water ________ b) For each of the following pairs, indicate which substance possesses the larger standard entropy: 50 g MgCl_2(s) at 50 degree C or 50g MgCl_2(aq) at 50 degree C _______ 1 mol of Cl_2(g) or 1 mol of C_2H_6_(g) _______ 1 mol of H_2O_(l) or 1 mol of H_2O(g) ________ 1 mol of F_2(g) or 1 mol I_2(g) _______ The molar heats of fusion and vaporization of benzene are 10.9 kJ/mol and 31.0 kJ/mol, respectively. Calculate the entropy changes for the solid-to-liquid and liquid-to-vapor transitions for benzene. At 1 atm pressure, benzene melts at 5.5 degree C and boils at 80.1 degree C.Explanation / Answer
problem 1:
a)
(i) As decomposition results in two products from 1, delS = positive
(ii) delS= positive as the kinetic energy of Br2 vapour increases as temperature increases.
(iii) delS= negative as H2O vapor from gaseous form converts to liquid (disordered form to ordered form)
(iv) delS= negative as two gaseous reactants react to form an organised solid product
(v) delS= positive as dissolution increases sugar
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