P1V1/T1 = P2V2/T2
P1 = 646 torr = 0.85 atm
V1 = 2.06 L
T1 = 273 + 25 = 298 K
P2 = 1.24 atm
V2 =275.5 mL = 0.2755 L
T2 = ?
(0.85*2.06) / 298 = (1.24*0.2755)/T2
1.75 / 298 = 0.342 / T2
0.00587 = 0.342 / T2
T2 = 0.342 / 0.00587 = 58.2 K
T2 = - 214.8 0C
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