# thermal physic

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Thread starter 7 months ago
#1
https://filestore.aqa.org.uk/resourc...-74082-SQP.PDF
question 3.3 i dont why you use atmospheric temp,
https://filestore.aqa.org.uk/resourc...-74082-SMS.PDF
mark scheme
thank you
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7 months ago
#2
(Original post by hkgbknhl)
https://filestore.aqa.org.uk/resourc...-74082-SQP.PDF
question 3.3 i dont why you use atmospheric temp,
https://filestore.aqa.org.uk/resourc...-74082-SMS.PDF
mark scheme
thank you
Guess you want to know the calculation steps in the mark scheme? to get the amount of Substance n, you can use the equation n*M = m => n = m/M. The values molar mass M and (inflated) mass m of the air can be read out in the paper

As it is described in the paper, you should assume that it is an ideal gas in the ball, that is why you can use the equation of ideal gases:

pV = nRT

n has to be calculated, the other values are written in the problem.

In the text it is said that the pressure in the ball is 'above the atmospheric pressure' that is why you can use the atmospheric termperature, that is 290 K = 17 °C.
Last edited by Kallisto; 7 months ago
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