85. An open vessel at 27°C is heated until
three-fourths mass of the air in it has been
expelled. Neglecting the expansion of the
vessel, the temperature to which the vessel
has been heated is
1) 927°C 2) 108°C 3) 1000°C 4) 477°C
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T1 = 27°c = 27+273=300K
Let n1 be n
n2 = n-2n/5
=3n/5
T2=?
W. K. T
n1×T1 =n2×T2
n×300=3n/5×T2
T2 = 500K
=500-273
=277°c
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