Work is the mode of transference of energy. If the system involves gaseous substance and there is difference of pressure between system and surroundings, such a work is referred to as pressure - volume work `(W_(PV)= -P_(ext)DeltaV)`. It has been observed that reversible work done by the system is the maximum obtainable work. `w_(rev) gt w_(ir r)` The works of isothermal and adiabatic processes are different from each other. for isothermal reversible proces, `W_("isothermal reversible")=2.303 nRT log_(10) (V_(2)/V_(1))` `W_("adiabatic reversible")=C_(V) (T_(1)-T_(2))` Calculate work done when 1 mole of an ideal gas is expanded reversibly from 20 L to 40 L at a constant temperature of 300 K.A. 7.78kJB. `-1.73kJ`C. `11.73kJ`D. `-4.78kJ`

Work is the mode of transference of energy. If the system involves gas

1.	Work is the mode of transference of energy. If the system involves gaseous substance and there is difference of pressure between system and surroundings, such a work is referred to as pressure - volume work `(W_(PV)= -P_(ext)DeltaV)`. It has been observed that reversible work done by the system is the maximum obtainable work. `w_(rev) gt w_(ir r)` The works of isothermal and adiabatic processes are different from each other. for isothermal reversible proces, `W_("isothermal reversible")=2.303 nRT log_(10) (V_(2)/V_(1))` `W_("adiabatic reversible")=C_(V) (T_(1)-T_(2))` Calculate work done when 1 mole of an ideal gas is expanded reversibly from 20 L to 40 L at a constant temperature of 300 K.A. 7.78kJB. `-1.73kJ`C. `11.73kJ`D. `-4.78kJ`
Answer» Correct Answer - B `w=-2.303nRT" "log((P_(1))/(P_(2)))` `=-2.303xx1xx8.314xx273" "log((1)/(0.1))` `=-5.227kJ` `q=-w=+5.227kJ` for isothermal process.

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