The easy way to do this is to remember the gas laws. Pressure increases with increasing temperature. Therefore, if T is going from 82C to -28C you know it is being cooled which means the pressure will decrease. So make the factor so you get a smaller number. Remember T must be in kelvin.
Final P = 1.20 atm x (T factor)
Calculate the final pressure, in atmospheres, for each of the following with n and V constant.
A gas with an initial pressure of 1.20 atm at 82∘C is cooled to -28∘C.
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