CBSE Class 11-science Chemistry Enthalpy Change

• Que: Differentiate between enthalpy and entropy??
• PMM2 kind is impossible according to
• a steel fiber is in a oxygen filled container which is closed with a frictionless piston. the iron in the steel fiber reacts with oxygen to form Fe2O3 , the heat generated by the reaction is removed during the process to maintain the temperature constant which is 25 degrees centigrade. for the reaction of 2 moles of iron 831.08KJ of heat is removed. calculate the heat , work and internal energy of change of the system
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• When 100ml of strong acid mixed with 100ml of strong base, change in temperature is 5°c. Determine the change in temperature when 10ml of strong acid mixed with strong base.
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• How is isothermal irreversible expansion cyclic  and how is delta H=0 for the process?
• The transition Sn(s, gray) ? Sn(s, white) is in equilibrium at 18°C and 1 atm pressure. If ΔS = 8.811K mol for the transition at 18°C and if the densities are 5.75 g/cm3 for gray tin and 7.28 g/cm3 for white tin, calculate the transition temperature under 100 atm pressure
  
• 6.63 sum
  
• One mole of anhydrous MgCl₂ dissolves in water and librates 25 cal/mol of heat. ?H_hydration of MgCl₂ = –30 cal/mol. Heat of dissolution of MgCl₂.7H₂O(s) is :- (1) +5 cal/mol (2) –5 cal/mol (3) 55 cal/mol (4) –55 cal/mol

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