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#9 | Work done in Isothermal Reversible Expansion
(Chemistry) > Thermodynamics
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Related Practice Questions :

When an ideal gas is compressed adiabatically and reversibly, the final temperature is:

(a) higher than the initial temperature

(b) lower than the initial temperature

(c) the same as the initial temperature

(d) dependent on the rate of compression

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Difficulty Level:

1 litre-atmosphere is equal to:

(a) 101.3 J                           (b) 24.206 cal

(c) 101.3 x 107 erg               (d) all of these

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Difficulty Level:

36 ml of pure water takes 100 sec to evaporate from a vessel and heater connected to an electric source which delivers 806 watt. The $∆{\mathrm{H}}_{\mathrm{vaporisation}}$ of H2O is:-

(1) 40.3 kJ.mol

(2) 43.2 kJ/mol

(3) 4.03 kJ/mol

(4) None of these

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Difficulty Level:

A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If ΔH is the enthalpy change and ΔE is the change in internal energy, then [KCET 2005]

(1) ΔH > ΔE

(2) ΔH < ΔE

(3) ΔH = ΔE

(4) The relationship depends on the capacity of the vessel

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Difficulty Level:

If ΔH is the change in enthalpy and ΔE the change in internal energy accompanying a gaseous reaction [KCET 1989; CBSE PMT 1990]

(1) ΔH is always greater than ΔE

(2) ΔH < ΔE only if the number of moles of the products is greater than the number of the reactants

(3) ΔH is always less than ΔE

(4) ΔH < ΔE only if the number of moles of the products is less than the number of moles of the reactants