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yummy:
please can someone help with this question.. what is the volume of gas at -30C and 0.75 atm if it occupies a volume of 255L at 40.0C and 1.25atm? thank you all

arnyk:
I can help you if you show me some workage.

Donaldson Tan:
1. convert all temperature to kelvin
2. solve using the general gas law, ie. PV = nRT (assume perfect gas)
3. n is constant since amount of gas remains unchanged.

arnyk:
Alrighty then, let's see what you are given and what you require.

Given:

P1 = 1.25 atm (convert to kPa)
V1 = 255 L
T1 = 40C (convert to K)

P2 = 0.75 atm (convert to kPa)
V2 = ?
T2 = -30C (convert to K)

Now what formula could you possibly use which utilizes all givens and solves for the variable?

As geodome said, n is constant. ;)

Combined
Gas
Law
=
Combined
Gas
Law

 ::)

xiankai:
a basically summarised version of arnyk's formula is the combined gas law, visually represented as:

P1V1/T1 = P2V2/T2.

n is the universal gas constant while R is the molar mass. molar mass is also a constant, so u can safely ignore it

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