Thermodynamics and Thermochemistry 105 [Useful information : 1 J= 1kg m's-2, 1 Pa = 1 kg m s; 1 bar 10 Pa] Given that AS (A +C) = 50 eu AS C + D) = 30 eu AS (D - B) = -20 euwhere, eu is entropy unit (a) 58001 bar (c) 14501 bar (b) 1450 bar (d) 29001 bar Then, AS (A B) is (2006, 3M) (a) + 100 eu (b) +60 eu 23. One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0 L to 2.0 L against a constant pressure of 3.0 atm. () -100 eu (d) -60 eu In this process, the change in entropy of surroundings (AS surr) in JK' is (1 L atm = 101.3 J) 30. A monoatomic ideal gas undergoes a process in which the ratio of p to Vat any instant is constant and equals to 1. What is the molar heat capacity of the gas ? (2016 Adv.) (2006, 3M) 4R (a) 3R (b) 2 5R (c) (a) 5.763 (b) 1.013 () - 1.013 (d) 5.763 (d) 0 24. The following reaction is performed at 298K 2NO(g)+ 02(g ) 2NO,(g) The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO, (g) at 298 K? (K,=1.6x 102) (2015 Main) 31. One mole of monoatomic ideal gas expands adiabatically at initial temperature Tagainst a constant external pressure of 1 atm from 1L to 2 L. Find out the final temperature (R = 0.0821 L atm K- mol-) (2005, 1M) T (b) (2)5/3 -1 (a) T (a) R(298) In (1.6x 102)- 86600 (b) 86600+ R(298) In (1.6x 102) In (1.6x 1012) (d) T + 3x 0.082 3 x 0.082 (c) 86600- R(298) moles of an ideal gas expanded isothermally and eversibly from 1L to 10 L at 300 K. What is the enthalpy change? (a) 4.98 kJ (d) 0.5[2x 86600- R(298) In (1.6x 102 )] (2004, 1M) 25. For the process, H20(1) H20 (g) at T = 100C and 1 atmosphere pressure, the correct choice (b) 11.47 kJ (c) -11.47 kJ (d)0 kJ 33. Spontaneous adsorption of a gas on solid surface is an exothermic process because (a) AH increases for system (b) AS increases for gas (c) AS decreases for gas () AS >0 and AS surrounding O system (2004, 1M) (b) AS gystem >0 and AS gurrounding