Recall that the standard enthalpy of formation (ΔH˚f) refers to the enthalpy change for the formation of 1 mole of a compound from its elements in their standard states.
This means for CaCO3, the reaction involves the formation of 1 mole of CaCO3 from Ca, C, and O in their standard states.
In their standard states, Ca and C both exist as a solid, Ca(s) and C(s), while O exists as a diatomic gas, O2(g).
What is the balanced chemical equation for the reaction used to calculate Δ H∘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.
Express your answer as a chemical equation.
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