2- what can be said about the properties of the two gases that have the van der

Question

2- what can be said about the properties of the two gases that have the van der waals constant given below Gas a/dm6atm.mol 1.24 1.36 b/dm.mol 0.0385 0.0318 (a) the attractive force and excluded volume in the 2 gases canceled each other out. (b) The excluded volume of gas 1 id greater than the excluded volume in gas 2 (c) both gasses exhibit ideal behavior at low temperature (d) the attractive force in gas 1 are stronger than those in gas 2 3-What additional inform ation is required to estimate ? H for reaction H2 + F2-> 2HF, ? H for the reaction ? H_-542.2 (a) Cp as a function of temperature for each reactant and product (b) Cv as a function of temperature for each reactant and product (c) The chemical potential at 350 K for each reactant and product (d) The absolute entropy at 350 K for each reactant and product 4- Theoretical calculations of sulfur oxides adsorbed Cads) on the Pt(I11 surface yield the data in the table below (kJ molrkJ.mol T298 KT-600 K Reaction -33 +20 SO2(g) +O(ads)SO(ads) -60 -38 O2(g)-O(ads) S03(ads) ? SO +50 Given this information, what can be concluded about the reaction (A) The reaction is endothermic and spontaneous at only one of the temperatures (B) The reaction is exothermic and spontaneous at only (C) The reaction is endothermic and spontaneous at both (D) The reaction is exothermic and spontaneous at both one of the temperatures temperatures. temperatures

Explanation / Answer

2. Van der Waals Equation:

The van der Waals equation corrects for the volume of, and attractive forces between gas molecules.

The equation is given as-

(P + )(V - nb) = nRT.

There are two corrective factors in van der Waals equation. The first, alters the pressure in the ideal gas equation. It accounts for the intermolecular attractive forces between gas molecules.

parameters: a, a measure of the average attraction between particles, and b, the volume excluded from v by one particle.

a) No , the gases have different properties as well as different attractive force and different excluded volume, hence they can not cancel out each other.

b) Yes, excluded volume of gas 1 is 0.0385 while excluded volume in gas 2 is 0.0318

c) Yes, because of very low attractive force between the gas atoms and at low temperature, the gaseous atoms tends to settle.

d) No ,the attractive force in gas 1 is 1.24dm6.atm.mol-1 while gas 2 has 1.36dm6.atm.mol-1.

3. For the given reaction,

H2 + F2 --> 2HF,

Both Cp and Cv are required to calculate Specific heat of the reaction.

And delH is calculated using the formula:

?H = m * s * delT

where, m= mass of reactant

s = specific heat of product

delT = Change in temperature

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