2
Question
For the combustion of CH4 at 1 atm pressure & 300 K, which of the following options is correct?
2M+O22→MO
ΔG1000∘C=−921kJ/mol
ΔG1900∘C=−300kJ/mol
2C+O22→CO
ΔG1000∘C=−432kJ/mol
ΔG1900∘C=−624kJ/mol
MO+CΔ−→M+CO↑
This reaction is feasible at temperature:
For the combustion of CH4 at 1 atm pressure & 300 K, which of the following options is correct?
2M+O22→MO
ΔG1000∘C=−921kJ/mol
ΔG1900∘C=−300kJ/mol
2C+O22→CO
ΔG1000∘C=−432kJ/mol
ΔG1900∘C=−624kJ/mol
MO+CΔ−→M+CO↑
This reaction is feasible at temperature:
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Solution
The correct option is A 1900∘C
At100℃,2M+O2⟶2MO;ΔG=−921kJ/mole∴2MO⟶2M+O2;ΔG=921kJ/moleMO⟶M+12O2;ΔG=460.5kJ/mole−−−−−−−(i)2C+O2⟶2CO;ΔG=−432kJ/moleC+12O2⟶CO;ΔG=−216kJ/mole−−−−−−−−(ii)Adding(i)&(ii),MO+CΔ−−−−−−−−−−−−−−→M+CO↑;ΔG=460.5−216=244.5kJ/mole∴ΔG>0 ∴ It is not feasible.At1900℃,2M+O2⟶2MO;ΔG=−300kJ/mole∴2MO⟶2M+O2;ΔG=300kJ/moleMO⟶M+12O2;ΔG=150kJ/mole−−−−−−−(iii)2C+O2⟶2CO;ΔG=−624kJ/moleC+12O2⟶CO;ΔG=−312kJ/mole−−−−−−−−(iv)Adding(iii)&(iv),MO+CΔ−−−−−−−−−−−−−−→M+CO↑;ΔG=150−312=−162kJ/mole∴ΔG<0 ∴ It is feasible.
At100℃,2M+O2⟶2MO;ΔG=−921kJ/mole∴2MO⟶2M+O2;ΔG=921kJ/moleMO⟶M+12O2;ΔG=460.5kJ/mole−−−−−−−(i)2C+O2⟶2CO;ΔG=−432kJ/moleC+12O2⟶CO;ΔG=−216kJ/mole−−−−−−−−(ii)Adding(i)&(ii),MO+CΔ−−−−−−−−−−−−−−→M+CO↑;ΔG=460.5−216=244.5kJ/mole∴ΔG>0
∴ It is not feasible.
At1900℃,2M+O2⟶2MO;ΔG=−300kJ/mole∴2MO⟶2M+O2;ΔG=300kJ/moleMO⟶M+12O2;ΔG=150kJ/mole−−−−−−−(iii)2C+O2⟶2CO;ΔG=−624kJ/moleC+12O2⟶CO;ΔG=−312kJ/mole−−−−−−−−(iv)Adding(iii)&(iv),MO+CΔ−−−−−−−−−−−−−−→M+CO↑;ΔG=150−312=−162kJ/mole∴ΔG<0
∴ It is feasible.
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