Consider the Following Gas Phase Reaction at 25°C

question 70

Multiple Choice

Consider the following gas phase reaction at 25°C. N₂(g) + C₂H₂(g) ⇌ 2 HCN(g)
600 mol N₂(g) and 1.750 mol C₂H₂(g) are placed in a 1.000 L vessel and the mixture is allowed to react. At equilibrium, there are 1.587 mol N₂(g) in the mixture. What is Kc for this reaction at 25 °C?

• A) 9.8 × 10^-4
• B) 9.4 × 10^-3
• C) 2.5 × 10^-4
• D) 4.7 × 10^-3
• E) 6.7 × 10^-5

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Definitions:

Enzyme Molecule

A biological catalyst that speeds up the rate of chemical reactions in cells without being consumed in the process.

Substrate

A substance on which an enzyme acts; a reactant in an

Energy of Activation

The minimum amount of energy required to start a chemical reaction, often lowered by the presence of a catalyst.

Existing Bonds

Bonds that have already been issued and are currently traded in the bond market.