MgCO2(s)-> MgO9(s) + CO2(g)

Question

A. what is delta H reaction when 3.35 mol of CO2 react with excess MgO?

B. What is delta H reaction when 305.5 g of MgCO3 decomposes.

Answer 1

dHrxn = (n*dHf products) - (n*dHf reactants)

dHf = delta H formation. Look this up in your text/notes.