Gen Physics HW Help: Ideal Gas Law and Temperature Change

In summary, the question is asking how much of the air molecules in a house need to be pushed outside in order to raise the temperature from 16C to 20C, given that the pressure remains constant. The equation used is PV=NkT, and the temperature ratio in degrees Kelvin is needed. The provided answer is 0.0136, but the process for getting this answer is unclear.
  • #1
pyizzle
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HW Help: Absolute temp and ideal gas law

Homework Statement


What fraction of the air molecules in a house must be pushed outside while the furnace raises the inside temperature from 16C to 20C? The pressure does not change since the house is not 100% airtight.


Homework Equations


PV=NkT
PV/T=PV/T
?


The Attempt at a Solution


NkT=NkT? N2/N1 = T2/T1. N2 = .80N1. Answer provided is .0136. I can't figure how that answer comes about. Help would be grateful. Thanks.
 
Last edited:
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  • #2
You need to take the temperature ratio in degrees Kelvin i.e. T=0 should be absolute zero.
 
  • #3
Assuming the pressure inside the house does not change, your formula is correct. It's OK to solve in degrees C, the answer is relational.
 

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