(show all your works from part a to part d and please don\'t skip any questions

Question

(show all your works from part a to part d and please don't skip any questions. Thanks you)

a. cricle the chemical with the higher enthalpy for each of the following pairs and explain your answer:

(i) 1mol H2O(l), 1mol H2O(g)

(ii) 2mol H(g), 1mol H2(g)

(iii) 7mol Kr(g), 9mol Kr(g) at the same temperature

(iv) 1mol O2(g)@2500C, 1mol 1mol O2(g)@2000C

b. what is a thermochemical equation?

c. the reaction of sulfur with hydrogen to produce hydrogen sulfide has a change in enthalpy of -161.6kJ/mol. Write the balanced thermodynamic equation for this reaction. Is this reaction is endothermic or exothermic?

d. the decomposition of magnesium carbonate into magnesium oxide and carbon dioxide involves a change in enthalpy of +117.3kJ/mol. Write the balanced thermodynamic equation for this reaction. Is this reaction is endothermic or exothermic?

Explanation / Answer

A thermal equation is represent the chemical reaction in which the reactants and products are balanced by their reapective stoichiometric coefficients and also include the dH (change in enthalpy) of the reaction
S(s) + H2 (g) ------> H2S (g) ; dH = -161.6 kJ/mol
the above reaction is Exothermic reaction since the dH value is -ve
dH = dH products - dH reactants
MgCO3 (s) ------> MgO(s) + CO2 (g) ; dH = +117.3 kJ/mol
the above reaction is Endothermic reaction since the dH value is +ve
dH = dH products - dH reactants

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