What is the balanced chemical equation for the reaction used to calculate δH∘f 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.
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The enthalpy change which occurs when reactants in standard state produce exactly one mole of a product is called enthalpy of formation and denoted by ΔH∘f. More on [standard enthalpies] in chemical principles lecture.
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