Guide :High School

supposed you wanted to calculate the heat of reaction for the formula of ammonia gas and gaseous hydrochloric acid from solid ammonium chloride

Supposed you wanted to calculate the heat of reaction for the formula of ammonia gas and gaseous hydrochloric acid from solid ammonium chloride
You would use your standard enthalpy of formation table to calculate the change in enthalpy (heat), which should be provided by your teacher. Moving forward, to find the change in enthalpy you need to calculate the sum of the enthalpy of formation of the products multiplied by their coefficients subtracted by the sum of the enthalpy of formation of the reactants multiplied by their coefficients. Using my thermodynamic table (the closest table I have on me right now), I get:Chemical equation: NH4Cl (s) ⇆ NH3 (g) + HCl (g)ΔH = [(NH3 (g)) + (HCl (g))] - [(NH4Cl (s))]      = [(-46.3 kJ/mol) + (-92.3 kJ/mol)] - [(-315.39 kJ/mol)]      = [-138.6 kJ/mol] + 315.39 kJ/mol      = 176.79 kJ/molI would check the values provided in your tables for accuracy though, but it should be slightly different in value.Hope this helps! ...

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