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Question

An empty LPG cylinder weighs 14.8 kg. When full, it weighs 29.0 kg and shows a pressure of 3.47 atm. In the course use at ambient temperature, the mass of the cylinder is reduced to 23.0 kg. The final pressure inside the cylinder is____atm.
(Nearest Integer)
(Assume LPG to be an ideal gas)

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Solution

Initial amount of gas present in the cylinder
(29.014.6)
=14.2 kg
Final amount of gas present in the cylinder
(23.014.8)
=8.2 kg
P1n1=P2n2
P2=n2×P1n1=8200MM×3.47×MM14200
P2=2 atm

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