Question

23. Assume each reaction is carried out in an open container. For which reaction will AH = "AE?
1) 200(g) + O2(g) → 2C02(g)
2) H2(g) + Br2(g) → 2HBr(g)
3) C(s) + 2H20(g) → 2H2(g) + CO2(g)
4) PCl, (g) → PCl2(g) + Cl 2(g)​

Answer 1

Answer:

Correct option is

A

H

2(g)

+ Br

2(g)

→ 2HBr

(g)

We know that, △H=△U+△PV

But for a physical or chemical change, △H=△U+△ngRT

where, △

n

g= No. of gaseous moles of product- Reactant

So, For △H=△U or △H=△E

△ng has to =0

In A option △ng=2−2=0 ; Therefore, △H=△E.

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