The temperature of an open room of volum...

The temperature of an open room of volume `30 m^(3)` increases from `17^(@)C` to `27^(@)C` due to sunshine. The atmospheric pressure in the room remains `1xx10^(5)` Pa. If `n_(i)` and `n_(f)` are the number of molecules in the room before and after heating, then `n_(f)-n_(i)` will be

`-1.61 xx 10^(23)`

`1.38 xx 10^(23)`

`2.5 xx 10^(25)`

`-2.5 xx 10^(25)`

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