Question

On hot days, you may have noticed potato chip bags seem to inflate, even though they have not been opened. If I have a 250 mL bag at a temperature of 19 C and I leave it in my car which has a temperature of 60 C , what will the new volume of the bag be?1) name the law first 2) identify the given, write the equation, show your work

Answer 1

The first law here is Charles's law and the new volume will be 285.08 mL

Converting degree celsius to kelvin when solving gas laws problem.

kelvin = degree celsius + 273.15

Kelvin = 19 + 273.15 = 292.15 K

Kelvin = 60 + 273.15 = 333.15 K

Given Data:

V1 (initital volume) = 250 ml

T1 (initial temperature) = 19°c or 292.15 K

V2 (final volume) = unknwon ?

T2 (final temperature) = 60°c  or 333.15 K

Charles' law which states that volume is directly proportional to temperature when the amount and pressure of the gas are constant.

Applying the formula, we get

V2 = V1T2 / T1

   = 250 ml × 333.15 K / 292.15 K    (cancel kelvin unit)

    = 83287.5 ml / 292.15

    = 285.08 ml

The new volume will be 285.08 ml

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