a)derive the general mass transfer equation in Cartesian coordinates. b) The molecular weight of two components And B of a gas mixture are 24 and 28 respectively. The molecular weight of gas mixture is found to be 30. If the mass concentration of the mixer is 1.2 kgm3, determine  I) Molar fraction II)mass fraction, III) total pressure if the temperature of the mixture is 290K.

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