Which of the following correctly represents reaction for estimating standard enthalpy of formation of HBr?
Question
Which of the following correctly represents reaction for estimating standard enthalpy of formation of HBr?
Solution
The standard enthalpy of formation of HBr can be estimated from the following reaction:
1/2 H2(g) + 1/2 Br2(l) -> HBr(g)
This reaction represents the formation of 1 mole of HBr from its elements in their standard states. The standard state of hydrogen is H2(g) and that of bromine is Br2(l). The coefficients represent the stoichiometric amounts of reactants and products. The standard enthalpy change for this reaction is the standard enthalpy of formation of HBr.
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