A heat engine carries one mole of an ide...

A heat engine carries one mole of an ideal mono-atomic gas around the cycle as shown in the figure below. Process `1 rarr 2` takes place at constant volume, process `2 rarr 3` is adiabatic and process `3 rarr 1` takes place at constant pressure. Then the amount of heat added in the process `1 rarr2` is

3740 J

`-3740 J`

1810 J

3220 J

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