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Given that 2Al + 3/2O2 → Al2O3; ΔH1 = -400 kcal/mol. 4 years ago Jaiyush19 jee jee main thermodynamics For which one of the processes represented by the following equations the enthalpy (heat) change is likely to be negative 4 years ago Jaiyush19 jee jee main thermodynamics An ideal gas expands against a constant external pressure of 2.0 atmosphere from 20 litre to 40 litre and absorbs 10 kJ of heat from surroundings. What is the change in internal energy of the system? 4 years ago Jaiyush19 jee jee main thermodynamics Assuming that water vapour is an ideal gas, the internal energy change (ΔU) when 1 mol of water is vapourised at 1 bar pressure and 100°C 4 years ago Jaiyush19 jee jee main thermodynamics The standard enthalpy of formation (Δf H°298) for methane, CH4 is -74.9 kJ mol-1. In order to calculate the average energy given out in the formation of a C – H bond from this it is necessary to know which one of the following? 4 years ago Jaiyush19 jee jee main thermodynamics The standard enthalpy of formation of NH3 is -46.0 kJ/mol. If the enthalpy of formation of H2 from its atoms is -436 kJ/mol and that of N2 is -712 kJ/mol, the average bond enthalpy of N - H bond in NH3 is: 4 years ago Jaiyush19 jee jee main thermodynamics A heat engine carries one mole of an ideal mono-atomic gas around the cycle as shown in the figure. Select the correct option: 4 years ago Jaiyush19 jee jee main thermodynamics Following reaction occurs in an automobile 2C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(g). The sign of ΔH, ΔS and ΔG would be 4 years ago Jaiyush19 jee jee main thermodynamics The heat of atomization of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light capable of breaking the C – C bond is 4 years ago Jaiyush19 jee jee main thermodynamics Which of the following statements/relationships is not correct in thermodynamic changes? (a) ΔU = 0 (isothermal reversible expansion of a gas) 4 years ago Jaiyush19 jee jee main thermodynamics What is the value of change in internal energy at 1 atm in the process? H2O(1,323k) → H2O(g, 423 K) 4 years ago Jaiyush19 jee jee main thermodynamics A cyclic process ABCD is shown in P–V diagram for an ideal gas. Which of the following diagram represents the same process? 4 years ago Jaiyush19 jee jee main thermodynamics Equal volumes of methanoic acid and sodium hydroxide are mixed. If x is the heat of formation of water, then heat evolved on neutralization is 4 years ago Jaiyush19 jee jee main thermodynamics The latent heat of vapourization of a liquid at 500 K and 1 atm pressure is 10.0 kcal/mol. What will be the change in internal energy (ΔU) of 3 moles of liquid at the same temperature 4 years ago Jaiyush19 jee jee main thermodynamics One mole of an ideal gas at 300 K is expanded isothermally from an initial volume of 1 litre to 10 litres. 4 years ago Jaiyush19 jee jee main thermodynamics A gas expands adiabatically at constant pressure such that T ∝ V^-1/2. The value of γ(Cp,m /Cv,m) of the gas will be : 4 years ago Jaiyush19 jee jee main thermodynamics Heat of neutralization of a strong acid HA and a weaker acid HB with KOH are –13.7 and – 12.7 k cal mol^-1. When 1 mole of KOH was added to a mixture containing 1 mole each of HA and HB, the heat change was – 13.5 kcal. 4 years ago Jaiyush19 jee jee main thermodynamics If bond enthalpies of N ≡ N, H –H and N –H bonds are x1, x2 and x3 respectively, ΔHf^o for NH3 will be 4 years ago Jaiyush19 jee jee main thermodynamics One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K) → (4.0 atm, 5.0 L, 245 K) with a change in internal energy, ΔU = 30.0 L atm. The change in enthalpy ΔH of the process in L atm is 4 years ago Jaiyush19 jee jee main thermodynamics If a reaction involves only solids and liquids which of the following is true? 4 years ago Jaiyush19 jee jee main thermodynamics Page 5 / 5 Prev 1 2 3 4 5 Share: Super Globals Requests: Server: Options and Features route: community use_home_url: url: https://eanshub.com/community/ pageid:187 default_groupid: 3 2022 How Can We Help? 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