What is the balanced chemical equation for the reaction used to calculate Hf of

Question

What is the balanced chemical equation for the reaction used to calculate Hf of CaCO3(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. The standard enthalpy of formation (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 C , and all the species present at a concentration of 1 M . A "standard enthalpies of formation table" containing Hf values might look something like this: Substance Hf H(g) 218 kJ/mol H2(g) 0 kJ/mol Ca(s) 0 kJ/mol Ca2+(aq) 543 kJ/mol C(g) 71 kJ/mol C(s) 0 kJ/mol N(g) 473 kJ/mol O2(g) 0 kJ/mol O(g) 249 kJ/mol S2(g) 129 kJ/mol

Explanation / Answer

Ca(s) + C(s) + 3/2 O2(g) --> CaCO3(s)

HofCaCO3 = [ 0 + 0 + (3/2 * 0 ] = 0 kJ / mol

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