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Grade 12th passPhysical Chemistry

final pressure is higher than intial pressure of a container filled with ideal gas at constant temperature .what will be the value of equilibrium constant ?
a)k=1 b)k=10 c)k>1 d}k

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8 Years agoGrade 12th pass
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ApprovedApproved Tutor Answer1 Year ago

To tackle the question regarding the equilibrium constant (K) when the final pressure of an ideal gas in a container is higher than its initial pressure at constant temperature, we need to delve into the principles of chemical equilibrium and the behavior of gases. The equilibrium constant is a crucial concept in understanding how reactions proceed and how concentrations of reactants and products relate to each other at equilibrium.

Understanding Equilibrium Constant

The equilibrium constant (K) is defined for a given reaction at a specific temperature. It is the ratio of the concentrations (or partial pressures) of the products to the reactants, each raised to the power of their coefficients in the balanced chemical equation. For a general reaction:

  • A + B ⇌ C + D

The equilibrium constant expression would be:

K = [C]^c [D]^d / [A]^a [B]^b

Analyzing the Situation

In your scenario, we have a container filled with an ideal gas, and we observe that the final pressure is higher than the initial pressure while maintaining a constant temperature. This situation suggests that the gas is either being compressed or that additional gas has been introduced into the system.

When we consider the ideal gas law, which states that PV = nRT (where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature), an increase in pressure at constant temperature implies that either the volume has decreased or the number of moles of gas has increased.

Implications for the Equilibrium Constant

Now, if we assume that the system is at equilibrium and the pressure has increased due to a change in the number of moles of gas, we need to consider how this affects the equilibrium constant. If the reaction produces more moles of gas than it consumes, the equilibrium constant will be greater than 1 (K > 1). Conversely, if the reaction consumes more moles of gas, K would be less than 1 (K < 1).

Since the final pressure is higher than the initial pressure, it indicates that the system has shifted towards the products side, assuming that the reaction produces more gas. Therefore, we can conclude that:

Final Answer

The value of the equilibrium constant in this case would be:

  • K > 1

This indicates that at equilibrium, the concentration of products is greater than that of the reactants, consistent with the increase in pressure observed in the system.