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One mole of a monoatomic ideal gas was i...

One mole of a monoatomic ideal gas was isobarically heated from 300 K to 600 K at constant pressure of one atm. Subsequently, it is subjected to reversible adiabatic expansion till the volume becomes `4sqrt2` of origingl (starting) value. After that it is subjected to isobaric cooling to original volume.
what is the chanege in enthalpy in adiabatic process ?

A

`-750`R

B

`+500`R

C

`+750`R

D

`-500`R

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a
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