Problem: Calculate the enthalpy change (ΔH) for the following reaction:H2(g) + F2(g) = 2HF

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We’re being asked to determine the standard enthalpy change of formation (ΔH˚f) for acetone. Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved



H°rxn = nH°f products -  mH°f reactants

where: n and m are the coefficients of the balanced reaction. 


The chemical equation for that reaction is:

H2(g) + F2(g) = 2 HF


Make sure that the reaction is balanced: 


          Reactants        Products

H           2                      2                 

F           2                       2

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Problem Details

Calculate the enthalpy change (ΔH) for the following reaction:

H2(g) + F2(g) = 2HF