The standard enthalpy of formation ( H f) is the enthalpy change that occurs whe

Question

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:

What is the balanced chemical equation for the reaction used to calculate Hf of SrCO3(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.

Substance Hf H(g) 218 kJ/mol H2(g) 0 kJ/mol Sr(s) 0 kJ/mol Sr2+(aq) 549.7 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

The standard enthalpy of formation ( H f) is the enthalpy change that occurs whe

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