Question

Q. Which of the following does not affect the rate of reaction?  
(1) Amount of the reactant taken 
(2) Physical state of the reactant  
(3) ∆ H of reaction 
(4) Size of vessel
answer is option 3 please explain and also explain how the size of vessel affects rate of reaction

Answer 1

Answer:

The correct option is (3), the enthalpy change of the reaction.

Explanation:

• The amount of the reactant, the physical state of the reaction and the size of the vessel are all factors which affect the rate of the reaction

• The enthalpy change ΔH of the reaction is a constant value and does not affect the rate of the reaction.
• A key concept in thermodynamics is enthalpy.
• It is a system's heat capacity.
• The enthalpy change that occurs during a reaction is the heat that enters or exits the system.
• An important aspect that affects whether a reaction may occur is whether the enthalpy of the system increases (i.e., because energy is added) or lowers (i.e., because energy is given off).

The enthalpy change Δ H does not affect the rate of reaction.

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Answer 2

The amount of the reactant and the physical state of the reaction as well as the size of the vessel are the factors that affect the rate of the reaction.

The enthalpy does not affect the rate of reaction the reasons are :

The enthalpy change Delta H of the reaction will always be a constant value.

It doesn't affect the rate of reaction.

Enthalpy is a major key concept in thermodynamics.

Enthalpy is defined as the systems heat capacity.

The change in enthalpy occurs during when the heat enters or exists the system.

When the energy is added the enthalpy increases

when energy is released the enthalpy decreases.

Hence therefore the correct option is 3) ∆ H of reaction 

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