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Q.

Argon is an inert gas used in light bulbs to retard the vaporization of the filament. A certain light-bulb containing argon at 1.25 atm and 18^oC is heated to 85^oC at constant volume. Calculate its final pressure.

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a

1.53 atm

b

1.25 atm

c

1.35 atm

d

2 atm

answer is A.

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Detailed Solution

Given, P₁=1.25atm , T₁= 18^oc = 291K

P₂= ? , T₂ = 85^oc = 358K

$\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}} \frac{1.25}{291} = \frac{P_{2}}{358} ∴ P_{2} = 1.53 atm$

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