Question 26 The standard enthalpy of formation (AHf) is the enthalpy change that

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Question 26 The standard enthalpy of formation (AHf) is the enthalpy change that occurs when exactly 1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of 25 C, and all the species present at a concentration of 1 M.A"standard enthalpies of formation table" containing AHf values might look something like this: Substance AEa 218 kJ/mol H(g) 0 kJ/mol Mg(s) 0 kJ/mol Mg2+(aq) -462.0 kJ/mol C(g) 71 kJ/mol C(s) 0 kJ/mol 473 kJ/mol. N(g) 0 kJ/mol O(g) 249 kJ/mol 129 kJ/mol Part A What is the balanced chemical equation for the reaction used to calculate AHf of MgCO3 (s)? If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution. Express your answer as a chemical equation. Submit Hints My Answers Give Up Review Part Continue Provide Feedback

Explanation / Answer

1. Mg(s) + C(s) + 3/2O2(g) --> MgCO3(s)

by using this equation we can calculate standard enthalphy of formation of MgCO3

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