The electron gain enthalpy of chlorine is 349 kJ `mol^-1`. How much energy in kJ is released when 1 gm of chlorine is converted completely to `Cl^-` ions in the gaseous state?

How would you account for the following : The electron gain enthalpy with negative sign for fluorine is less than that for chlorine, still fluorine is a stronger oxidising agent than chlorine.

An electron in a hydrogen atom in its ground state absorbs 1.5 times as much energy as the minimum required for it to escape from the atom. What is the velocity of the emitted electron?

Activation energy for the acid catalysed hydrolysis of sucrose is 6.22 kJ mol^-1 , while the activation energy is only 2.15 kJ mol^-1 when hydrolysis is catalysed by the enzyme sucrase. Explain.

A capacitor is charged through a potential difference of 200 V, when 0.1 C charge is stored in it. How much energy will it release, when it is discharged?

The time for half life period of a certain reaction A rarr Products is 1 hour. When the initial concentration of the reactant ‘A’ is 2.0 mol L^-1 , how much time does it take for its concentration to come from 0.50 to 0.25 mol L^-1 ? if it is a zero order reaction?

The activation energy of a first order reaction at 300 K is 60 kJ mol^-1 . In the Presence of a Catalyst, the activation energy gets lowered to 50 kJ mol^-1 at 300 K. How many times the reaction rate changes in the Presence of a catalyst at the same temperature ?

Knowing the electron gain enthalpy values for O rarr O^- and O rarr O^(2-) as -141 and 702 kJ mol^-1 respectively, how can you account for the formation of a large number of oxides having O^(2-) species and not O^-

Gasoline has an enthalpy of combustion 24000 kJ/mol gallon. When gasoline burns in an automobile engine, approximately 30% of the energy released is used to produce mechanical work. The remainder is lost as heat transfer to the engine's cooling system. As a start on estimating how much heat transfer is required, calculate what mass of water could be heated from 25^(@)C to 75^(@)C by the combustion of 1.0 gallon of gasoline in an automobile? (Given : C(H_(2)O)=4.18 J//g^(@)C ) a) 34.45 kg b) 80.383 kg c) 22 kg d) 224 kg