Bond Energy And Standard Enthalpy Page 3
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1
2
3and is then heated to 118.1°C (its normal boiling
point) at 1.00 atm. The sample is allowed to
vaporize at 118.1°C and is then rapidly quenched
to 17.0°C, so that it recrystallizes. Calculate
∆H° for the total process as described.
5.42 You are given the following data:
(g) Æ 2H(g)
H
∆H° = 436.4 kJ
2
(g) Æ 2Br(g)
Br
∆H° = 192.5 kJ
2
(g) Æ 2HBr(g) ∆H°=-72.4 kJ
H
(g) + Br
2
2
Calculate ∆H° for the reaction
H(g) + Br(g) Æ HBr(g)
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