Which one of the following equations represents the formation reaction of CH3OHU

Question

Which one of the following equations represents the formation reaction of CH3OHU? C(g) + 4H(g) + O(g) rightarrow CH3OH(l) C(graphite) + 2H2(g) + 1/2O2(g) rightarrow CH3OH(l) C(g) + 4H(g) = O(g) rightarrow CH3OH(l) C(graphite) + 4H(g) + O(g) rightarrow CH3OH(l) C(diamond) + 4H(g) + O(g) rightarrow Ch3OH(l) Calculate the deltaHdegree rtimesn for the decomposition of calcium carbonate to calcium oxide and carbon dioxide. deltaHdegree f [CaCO3(s)] = -1206.9 kJ/mol; deltaHdegreef [CaO(s)] = -635.1 kj/mol; deltaHdegree f [CO2(g) = -393.5 kJ/mol CaCO3(s) rightarrow Ca)(s) + CO2(g) -2235.5 kJ 178.3 kJ -178.3 kJ 2235.5 kJ -1448.5 kJ Nitric acid, which is among the top 15 chemicals produced in the United States, was first prepared over 1200 years ago by heating naturally occurring sodium nitrate (called saltpeter) with sulfuric acid and collecting the vapors produced. Calculate deltaHdegree rtimesn for this =-1125.5 kJ/mol; deltaHdegree f

Explanation / Answer

CaCO3 => CaO + CO2

Delta H(rxn) = Delta Hf(products) - Delta Hf(reactants)

= Delta Hf(CaO) + Delta Hf(CO2) - Delta Hf(CaCO3)

= -635.1 + (-393.5) - (-1206.9)

= 178.3 kJ


Thus the answer is: B. 178.3 kJ

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