if known h2 + br2 produce delta h 2hbr totaled 11.2 -72 then to decipher hbr gas into H2 and br2 as much heat is required?

Question

if known h2 + br2 produce delta h 2hbr totaled 11.2 -72 then to decipher hbr gas into H2 and br2 as much heat is required?

Answer 1

To determine the amount of heat required to convert HBr gas into H2 and Br2, we need to calculate the enthalpy change for the reaction.

First, let's examine the given reaction: H2(g) + Br2(g) → 2HBr(g)

We are given the enthalpy change for this reaction, which is -72 kJ/mol.

To decipher HBr into H2 and Br2, we will consider the reverse reaction. By reversing the given reaction, we get: 2HBr(g) → H2(g) + Br2(g)

Now, we need to determine the enthalpy change for the reverse reaction. Since the enthalpy change for a reaction and its reverse reaction have the same magnitude but opposite sign, the enthalpy change for the reverse reaction will be +72 kJ/mol.

Therefore, to decipher HBr gas into H2 and Br2, +72 kJ/mol of heat is required.