Half a mole of helium at 27 °C and at a ...

Half a mole of helium at 27 °C and at a pressure of 2 atmosphere is mixed with 1.5 mole of `N_2` at 77 °C and at a pressure of 5 atmosphere so that the volume of the mixture is equal to the sum of their initial volumes. If the temperature of the mixture is 69 °C, then its pressure, in atmospheres, is

3.5

3.8

3.95

4.25

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