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Consider the following balanced thermochemical equation for the decomposition of the mineral magnesite: MgCO3(s)---MgO(s)+CO2(g) [d]Hrxn=117.3kJ (a) Is heat absorbed or released in the reaction? Absorbed Released (b) What is [d]Hrxn for the reverse reaction? (c) What is [d]H when 3.30 mol of CO2 reacts with excess MgO? (d) ‘What is 1115' when 33.5 g of CO: reacts with excess MgD‘?