18. Calculate ƒ´H for the following reaction using Hess law

Question

H2 (g) + Br2 (g) ¡÷ 2 HBr (g)

Experimental information

2 H+ ¡÷ H2 ƒ´H -436.4 kJ

2 Br- ¡÷ Br2 ƒ´H -192.5 kJ

2 H+ + 2 Br- ¡÷2 HBr ƒ´H -144.8 kJ

Answer 1

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Answer 2

Reverse equation 1 and add to the reverse of equation 2 and add equation 3 as is. Remember to change the sign of dH when reversing an equation.
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