Thermodynamics is the branch of physical science concerned with
According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy is
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A reaction, A + B → C + D + q is found to have a positive entropy change. The reaction will be
Comment on the thermodynamic stability of NO(g), given
Enthalpy of atomization is enthalpy change on breaking
In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?
Calculate the heat and the work associated with a process in which 5.00 mol of gas expands reversibly at constant temperature T = 298 K from a pressure of 10.00 to 1.00 atm
When gasoline burns in a car engine, the heat released causes the products CO2andH20 to expand, which pushes the pistons outward. Excess heat is removed by the car’s cooling system. If the expanding gases do 451 J of work on the pistons and the system loses 325 J to the surroundings as heat, calculate the change in energy (ΔE)
In the case of compounds such as CH3CH2Cl, CH3NO2etc which of the following is used as Bond enthalpy
The reaction of cyanamide, NH2CN (s), with dioxygen was carried out in a bomb calorimeter, and ΔU was found to be 742.7 kJ mol_1mol_1 at 298 K. Calculate enthalpy change for the reaction at 298 K.
For the reaction state whether exothermic and enthalpy change
first law of thermodynamics is a restatement of
Enthalpy of solution of a substance is the enthalpy change
Calculate the number of kJ of heat necessary to raise the temperature of 60.0 g of aluminium from 35∘C to 55∘C. Molar heat capacity of Al is 24 J mol−1K−1
For the reaction 40.7 kJ + H20(l) → H20(l) (g state whether exothermic and enthalpy change
According to first law of thermodynamics ΔU = q + w, where
The lattice enthalpy of an ionic compound is the
Calculate the enthalpy change on freezing of 1.0 mol of water at 10.0∘C to ice at -10.0∘C.
The state of a gas can be described by quoting the relationship between
A layer of copper welded to the bottom of a skillet weighs 125 g. How much heat is needed to raise the temperature of the copper layer from 25∘C to 300∘C? The specific heat capacity (c) of Cu is 0.387 J/g.K.