The standard enthalpy of formation (DeltaHdegree_f) is the enthalpy change that

Question

The standard enthalpy of formation (DeltaHdegree_f) 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 25degreeC, and all the species present at a concentration of 1 M . A "standard enthalpies of formation table" containing DeltaHdegree_f values might look something like this: What is the balanced chemical equation for the reaction used to calculate DeltaHdegree_f of BaCO_3 (s)? If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (1), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution. Ba(s) + CO_2(s) + 1/2O_2(g)

Explanation / Answer

from the data provided to calculate the delta Hf FOR BaCO3 (S),

we can write the chemical equation for the formation of BaCO3 ( s) AS,

Ba (s) + C (s) + 3/2 O2 ------------> BaCO3 (S) ,

DECOMPOSITION of BaCO3 (S) , GIVES ,

BaCO3 (S) --------> BaO (s) + CO2 (g),

in the formation of BaCO3 (S) it is required to use one mole of Ba (S) and ONE MOLE OF C (s) and 1.5 MOLES OF O2 molecule (i.e 3/2 O2) ,

(THERE ARE ONE BARIUM , ONE CARBON AND 1.5 O2 in product )

so the equation is Ba (s) + C (s) + 3/2 O2 ------------> BaCO3 (S)

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.