In the J-tube above, Y and X are on the same horizontal level and 30cm3 of air is trapped above Y when the atmospheric pressure is 75cm Hg, calculate the volume of air trapped above Y when 15cm Hg is now poured into the limb above X
-
A.
15 cm3 -
B.
25 cm3 -
C.
35 cm3 -
D.
45 cm3
Correct Answer: Option B
Explanation
Since the temperature of the air is to remain Constant => P1V1 = P2V2
∴ 75 x 30 = (75 + 15) x V2
75 x 30 = 90 x V2
| => V2 = | 75 x 30 |
| _90 |
| = | 2250 |
| _90 |
= 25cm2