Calculate $\Delta$ _rG ^$\circ$ for the Reaction Below at 25 $\Delta$ C
CH₄(g)+ H₂O(g)

question 34

Multiple Choice

Calculate $\Delta$ _rG ^$\circ$ for the reaction below at 25.0 $\Delta$ C
CH₄(g) + H₂O(g) $\to$ 3 H₂(g) + CO(g)
Given $\Delta$ _fG ^$\circ$ [CH₄(g) ] = -50.8 kJ/mol, $\Delta$ _fG ^$\circ$ 10 [H₂O(g) ] = -228.6 kJ/mol, $\Delta$ _fG ^$\circ$ 10 [H₂(g) ] = 0.0 kJ/mol,and $\Delta$ _fG ^$\circ$ [CO(g) ] = -137.2 kJ/mol.

• A) -416.3 kJ/mol-rxn
• B) -142.2 kJ/mol-rxn
• C) +142.2 kJ/mol-rxn
• D) +315.0 kJ/mol-rxn
• E) +416.3 kJ/mol-rxn

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Definitions:

Base

A substance that can accept hydrogen ions (protons) or more generally, donate a pair of valence electrons; in nucleic acids, a nitrogen-containing molecule that forms part of the genetic code.

Denitrifying Bacteria

Bacteria involved in the nitrogen cycle, converting nitrates in soil into nitrogen gas, thereby reducing nitrogen availability to plants.

Nitrate

A polyatomic ion with the chemical formula NO3− or a compound containing this ion; important in the nitrogen cycle and used in fertilizers.

Nitrogen Gas

A diatomic, colorless, odorless, and tasteless gas that makes up about 78% of the Earth's atmosphere.