Before a trip from New York to Boston, the pressure in the automobile tire is 2.1 atm at 280 K. At the end of the trip, the pressure gauge reads 1.88 atm. What is the new Celsius temperature of the air inside the tire?(Assume tires with constant volume).
This is how I did it: I used P1/T1-P2/T2. So I did (1.8)(280) which equals into 504, then I divided that by 2.1, which made 240, & then I subtracted 273 to make it into Celcius and got -33. That way was wrong so I did the problem again but this time I subtracted 273 from 280 first, & I got 7. Then, I multiplied 7 & 1.8 which made 12.6. I divided 12.6 by 2.1, & I ended up getting 6. This was wrong too. So, how am I suppose to solve it?
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