The molar heat capacities of Iodine vapour and solid are `7.8` and 14 cal/mol respectively. If enthalpy of iodine is 6096 cal/mol at `200^(@)C`, then what is `DeltaU` (internal energy change) at `250^(@)C` in cal/mol
Chemical reactions are invariably associated with the transfer of energy either in the form of hear or light. In the laboratory, heat changes in physical and chemical processes are measured with an instrument called calorimeter. Heat change in the process is calculated as: q= ms Delta T , s= Specific heat = c Delta T = Heat capacity. Heat of reaction at constant pressure is measured using simple or water calorimeter. Q_(v)= Delta U = Internal energy change, Q_(P) = DeltaH, Q_(P) = Q_(V) + P Delta V and DeltaH = Delta U+ Delta nRT . The amount of energy released during a chemical change depends on the physical state of reactants and products, the condition of pressure, temperature and volume at which the reaction is carried out. The variation of heat of reaction with temperature and pressure is given by Kirchoff's equation: (DeltaH_(2) - DeltaH_(1))/(T_(2)-T_(1))= Delta C_(P) (At constant pressure), (DeltaU_(2) - DeltaU_(1))/(T_(2)-T_(1)) = DeltaC_(V) (At constant volume) The specific heat of I_(2) in vapoour and solid state are 0.031 and 0.055 cal/g respectively. The heat of sublimation of iodine at 200^(@)C is 6.096 kcal mol^(-1) . The heat of sublimation of iodine at 250^(0)C will be
The bond dissociation energies for Cl_(2),I_(2) and Icl are 242.3, 151 and 211.3 kJ/mol respectively. The enthalpy of sublimation of iodine is 62.8 kJ/mol. What is the standard enthalpy of formation of ICl_((s)) ?
The standard molar enthalpies of formation of cyclohexane (l) and benzene (l) at 25^(@)C "are" -156 and +49kJ mol^(-1) respectively. The standard enthalpy of hydrogenation of cyclohexene (l) at 25^(@)C is -119kJ mol^(-1) . Use these data to estimate the magnitude of the resonance energy of benzene.
Latent heat of fusion and vaporisation of water are respectively 80 and 540 Cal g^(-1) . If the boiling point of a solution is 100.1^(@)C , what is its freezing point?
Latent heat of vapourisation of a liquid at 500k and 1atm pressure is 10K. Cal/mole. What is the change in internal energy when 3 moles of the liquid is vapourised at the same temperature
The molar heat capacity of water at constant pressure, C, is 75 JK^(-1) mol^(-1) . When 1.0KJ of heat is supplied to 100g of water which is free to expand, the increase in temperature of water is :
NARENDRA AWASTHI-THERMODYNAMICS-Level 3 - Match The Column
