MC CH6 #26A MC CH6 #26A Question 26 The standard enthalpy of formation (Delta Hf

Question

MC CH6 #26A

MC CH6 #26A Question 26 The standard enthalpy of formation (Delta Hf ) 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 ^ degree C , and all the species present at a concentration of 1M. A ^''standard enthalpies of formation table^'' containing delta Hf values might look something like this: Part A What is the balanced chemical equation for the reaction used to calculate Delta Hf 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.

Explanation / Answer

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

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