Question

Find total pressure observed after opening the stopcock . [neglecting the volume of the tube connecting the two bulbs]

• A. 1.33 atm
• B. 3 atm
• C. 0.3 atm
• D. 0.75 atm

Answer 1

The correct option is A

1.33 atm

Total pressure P = $\frac{P_1{V}_1+P_2{V}_2}{V_1+V_2}$

$\Rightarrow \frac{0.1\times 2+0.2\times 1}{0.1+0.2}\Rightarrow \frac{0.2+0.2}{0.3}\Rightarrow \frac{4}{3}\Rightarrow 1.33atm$