12. Dry air, occupying volume V at temperature T1 and pressure P, is passed over substance A at temperature T2 and saturated with the vapors of this substance. How much will the mass of the substance change after passing air? The vapor pressure of substance A at temperature T2 is taken from the tables. When calculating, keep in mind that the total pressure in the system during the entire process remains unchanged and equal to P.
variant Т1,К Р*10-4, Pa, Vm3 Substance А Т2,К
12 287 9.71 5 CH3OH 303

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