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Yes, those equations can be used to find the change in entropy but also keep in mind what reversible and irreversible reactions mean. A reversible reaction is one that has infinitesimal changes that can be reversible by addition or subtraction at any given point in time, whereas irreversible changes immediately and cannot be reverted to its original state. Reversible reactions are most commonly used in the context of isothermal reactions where delta U and delta H equal 0.
Irreversible processes are usually spontaneous and quick where as irreversible processes are slow and maintain equilibrium throughout the entirety of the process. However, I believe it will be clearly stated or inferred in any test.
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