Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 4.30 MJ of energy in the form of heat if the temperature of the sodium is not to increase by more than 10.0 C? Use Cp = 30.8 J/(K mol) for Na(1) at 500 K. mass of Na(I): g Question 12 of 26 > Consider the reaction. 2 FeO3 4 Fe +302 AH rxn = +824.2 kJ The formation of 14.0 g of O2 results in the absorption of 361 kJ of heat. the release of 1.20 10 kJ of heat. the release of 361 kJ of heat. the release of 3850 kJ of heat. the absorption of 3850 kJ of heat. the absorption of 1.20 102 kJ of heat. = -817.3 kJ AH = +491.7 kJ Question 17 of 26 > Given the reactions, X(s) + 2(g) XO(s) XCO3(s) XO(s) + CO2(g) what is AH for this reaction? X(s) + O2(g) + CO2(g) XCO3(s) AH = KJ