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A balloon of volume 1.5cm3 containing helium gas at a pressure of 3.0 x 106pa is released from the ground when the temperature is 20°C. What will be the pressure when it reaches a point where the volume becomes 3.0m and the temperature 5°C 

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V1 =1.5m                         V2 = 3.0m3
P1 = 3.0 × 106 Pa                P2  = ?
T1 = 293K                            T2 = 278K
formula for pressure and volume√1
3.0 × 1.5 × 106  = 3.0 × P 
       293                   278
P2 = 3.0 × 1.5 × 106 × 278
               3.0
P2 = 4.17 × 108Pa

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