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ionutvasiliev4237
02.01.2020 •
Chemistry
The standard enthalpy of certain reaction is approximately constant at +125kjmol-1 from 800k to 1500k. the standard gibbs energy is +25kjmol-1 at 1150k. estimate the temperature at witch the equilibrium constant becomes greater than 1.
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Ответ:
T = 3006.976 K
Explanation:
∴ ΔH° = 125 KJ/mol ( 800K - 1500K)
∴ ΔG° = 25 KJ/mol (1150 K)
⇒ T = ? ∴ K > 1
In the equilibrium:
K = e∧(ΔG°/RT)∴ K > 1
If ΔG°/RT = 1
⇒ e∧(1) = 2.72 > 1
∴ ΔG°/RT = 1
⇒ T = ΔG°/R = (25 KJ/mol)/(8.314 E-3 KJ/mol.K)
⇒ T = 3006.976 K
verifying:
K = e∧(ΔG°/RT)⇒ K = e∧(25/((8.314 E-3)(3006.976)))
⇒ K = 1.000000061 > 1
Ответ:
1. combustion
2. synthesis
3. double replacement
4. decomposition
5. single replacement
Explanation:
i just had a test on this lol