Mr. Felton McClure MD
Nov 12, 2024
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)?
For which of the following reactions is the standard enthalpy change (ΔH∘rxn) equal to the standard enthalpy of formation (ΔH∘f) of the product(s)? You do not need to look up any values to answer this question. Please check all that apply from the following reactions:
- Na(s) + 1/2 Cl2(g) → NaCl(s)
- CO(g) + 1/2 O2(g) → CO2(g)
- C(s, graphite) + O2(g) → CO2(g)
- BaCO3(s) → BaO(s) + CO2(g)
- 2 Na(s) + Cl2(g) → 2 NaCl(s)
- Na(s) + 1/2 Cl2(l) → NaCl(s)
1 Answers
Feb 13, 2025
The standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state (1 atm of pressure and 298.15 K) is formed from its pure elements under the same conditions.
Yes: Na(s)+1/2Cl2(g)→NaCl(s) ; should be ½ not 12Cl2(g)
NO CO(g)+12O2(g)→CO2(g) : CO is a compound
Yes: C(s,graphite)+O2(g)→CO2(g)
NO :BaCO3(s)→BaO(s)+CO2(g)
NO: Na(s)+Cl2(g)→2NaCl(s) since 2 moles of NaCl are formed
NO :Na(s)+1/2Cl2(l)→NaCl(s) since Cl2 is not a liquid at 1atm and 298 Kelvin
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