Question

At 300 K and under pressure of 100 atm the Z for O2 is 0.96. At 600 K and under pressure of 150 atm the Z for O2 is 0.8 for the same mass of O2. If the volume of O2 at 300 K and 100 atm press is 2L, then what mass of O2 (g) is required to fill a vessel of capacity 200 L at 600 K & 150 atm ?

• A. 36 kg
• B. 24.39 kg
• C. 16.82 kg
• D. 9.98 kg

Answer 1

Answer: (B)

24.39 kg

Answer 2

P₂ V₂ = n Z₂ RT₂

150 × 200 = n × 0.8 × 0.082 × 600

or n = $\frac { 150 \times 200 } { 0.8 \times 0.082 \times 600 }$ = 762.2 mole ŗ 24.39 kg