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29 January, 16:49

A sample of gas has an initial volume of 25 L and an initial pressure of 3.5 Pa. If the pressure changes to 1.3 Pa, find the new volume, assuming that the temperature remains constant.

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  1. 29 January, 19:17
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    Since you are provided with the pressure and initial volume and told a standard temperature, you should use the Combined gas law. This is (P1 V1) / T1 = (P2 V2) / T2

    STP is 273 k for temperature, so plug in the values.

    (3.5 Pa * 25 L) / 273 K = 1.3 Pa * X L) / 273 K.

    (this is the left side>) 0.32051 = 1.3 X / 273. Multiply both sides by 273 to get rid of it on the right, which leaves you with

    87.4999 = 1.3 X. Divide both sides by 1.3 and there you go,

    67.308 L
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