An-open-flask-contains-air-at-27-C-To-what-temperature-it-must-be-heated-to-expel-one-fourth-of-the-air-

Question Number 16079 by Tinkutara last updated on 17/Jun/17

An open flask contains air at 27 ° C . To

what temperature it must be heated to

expel one - fourth of the air ?

Commented by ajfour last updated on 18/Jun/17

i s i t 127 ° C ?

n R △ T + (△ n) R T = P △ V + V △ P

n △ T + T △ n = 0

△ T = \frac{- T (△ n)}{n}

= - T (- \frac{1}{4}) = \frac{T}{4}

T - T_{0} = \frac{T_{0}}{4} \Rightarrow T = 1.25 T_{0}

b u t w h a t i s n o r m a l t e m p e r a t u r e

T = 25 ° o r T = 0 ° ?

Answered by mrW1 last updated on 18/Jun/17

T_{2} / T_{1} = V_{2} / V_{1} = 1.25

T_{2} = 1 . {25 T}_{1}

t_{2} = T_{2} - 273 = 1.25 (27 + 273) - 273 = 102 ° C

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