Answer the following questions based on the potential energy diagram here: Does

Question

Answer the following questions based on the potential energy diagram here: Does the graph represent an endothermic or exothermic Determine the heat of reaction, delta H (enthalpy change) for this reaction. I'm looking for an actual number here. How much energy is absorbed by the Energy of activation? Again an actual numerical value. Given the following solutions, which would produce the lowest freezing point 0.20 m ethylene glycol 0.20 m LiCl 0.10 m MgSO_4 0.20 m Ca(NO_3)_2 of the compounds shown below, the one with the highest melting point would likely be: H_2O Ne K_20 KCI Sro Place H_2O, H_2, Ne, MgO and NaCI in order of increasing melting point (lowest to highest). This is all about intermolecular forces. H_2

Explanation / Answer

a)

the graph shos how reactants with E = 40 go to products with E = 20

the system lost energy, so it must be releasing energy, i.e. Exothermic

b)

heat of reaction is simple --> Hfinal - Hinitial = 20-40 = -20 kJ

c)

how much energy abosrbed the Ea --> Etop - Emin --> 100-40 = 60 kJ

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