a) 608 mmHg= 0.8 atm
m=44x+32y=380
x=y=>76y=380=>y=5=>x=5
nr moli amestec = 5+5=10 moli
pV=nRT=>V=10*400*0,082/0,8=410 l
b)2,6338*10^5 Pa = 2.6 atm
m=28x+32y=1440
x/y=4/1=>x=4y
28*4y+32y=1440=>144x=1440=>x=10 => y= 40
nr moli total = 10+40 = 50 moli
pV=nRT=> V = 50*0.082*260/2.6= 410 l