0.20mol of He and 1.00mol of an unknown compound (vapor pressure =0.70 atm at 300K ) are introduced to an evacuated empty vessel with a movable piston under the external pressure of 1atm . Considering the ideal gas behavior, determine the total volume of the gases (in L ) at 300K . (Take R =0.08 atm L mole -1 K -1 )

Question

0.20mol of He and 1.00mol of an unknown compound (vapor pressure =0.70 atm at 300K ) are introduced to an evacuated empty vessel with a movable piston under the external pressure of 1atm . Considering the ideal gas behavior, determine the total volume of the gases (in L ) at 300K . (Take R =0.08 atm L mole -1 K -1 ) (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Pressure of He=1-0.70=0.30 atm V=(n R T/P)=(0 . 20 × 0 . 08 × 300/0 . 30)=16L

Pressure of He=1−0.70=0.30 atm V=PnRT​=0.300.20×0.08×300​=16L

Pressure of $He = 1 - 0.70 = 0.30$ atm
$V = \frac{n RT}{P} = \frac{0.20 \times 0.08 \times 300}{0.30} = 16 L$