Practice Problem 5.6.1 Use and interpret standard heats of formation. a) Write the balanced chemical equation that represents the standard heat of formation of N₂O5(s) at 298 K. Be sure to specify states. Write fractions with a slash, such as 1/2 for one half. If a box is not needed leave it blank. + + 1 (b) The standard enthalpy change for the following reaction is -576 kJ at 298 K. 2 Na(s) + 1₂(s)-2 Nal(s) What is the standard heat of formation of NaI(s)? Check & Submit Answer Show Approach kJ/mol

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