What is the volume ratio (Vf/Vi) required if the entropy of a gas (2mol) is to be increased by 50% at 298.15K. (R=8.314Jmol^(-1)K^(-1)) ? a. (Vf/Vi) = 2.47 b. (Vf/Vi) = 1.83 c. (Vf/Vi) = 1.88 d. (Vf/Vi) = 1.03
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What is the volume ratio (Vf/Vi) required if the entropy of a gas (2mol) is to be increased by 50% at 298.15K. (R=8.314Jmol^(-1)K^(-1)) ?
a. (Vf/Vi) = 2.47
b. (Vf/Vi) = 1.83
c. (Vf/Vi) = 1.88
d. (Vf/Vi) = 1.03
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- Calculate the standard Gibbs free-energy change when SO3 forms from SO2 and O2 at 298 K. Why is sulfur trioxide an important substance to study? (Hint: What happens when it combines with water?)Which of the following statements must be true for the entropy of a pure solid to be zero? (i) The temperature of the solid must be 0 K. (ii) The solid must be crystalline, not amorphous. (iii) The solid must be perfectly ordered. (iv) The solid must be an element. Multiple Choice All four of i, ii, iii, and iv must be true Only i and ii must be true Only ii and iii must be true Only i and iii must be true Only i, ii, and iii must be trueUse the database on the textbook to calculate the entropy change of the following reaction under standard condition 1bar and 298 K: 2C2H6 (g) + 7O2 (g) = 4CO2 (g)+ 6H2O (L) ΔreactionS = _________ J/K/ (mol reaction). 4 sig. fig. per mole of reaction, not per mole of any subject. The data is copied from the appendix here material standard entropy ( J/K/mol) C2H6 229.60 O2 205.138 CO2 213.74 H2O(L) 69.91
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- 0 not enough information AS 0 not enough information AS < 0 AS = 0 17 AS 0 not enough information ●●● €3.(10p) The molar volume of a certain solid is 142.0 cm3mol-1 at 1.00 atm and 427.15 K, its melting temperature. The molar volume of the liquid at this temperature and pressure is 152.6 cm3mol-1. At 1.2 MPa, the melting. temperature changes to 429.26K. Calculate the enthalpy and entropy of fusion of the solid using the Clapeyron equation.(c) For reaction 1 taking place at 120 °C: Hg0(s) + S02(g) = Hg(l) + S03(g) Reaction 1 AreactG = -13.6 kJ mol-1 (i) Given the standard Gibbs free energy above for reaction 1, calculate AreactG when the partial pressures for S0, and SO2 are 1 bar and 0.004, respectively. (ii) Calculate the equilibrium constant for the reaction and hence state what will be the mole fraction of SO3 in the gas phase at equilibrium. Note: In calculation assume K=÷; where the term x is the mole fraction of SO3. 1-x