Problem on reversible and irreversible process

The second law states that dS ≥ (dQ/T), where dS = dQ/T for a reversible process and dS > dQ/T for an irreversible process.

a. Show that since dW₁₂ = -dW₂₁ (dW_reverse = -dW_forward) for a reversible process, then dQ₁₂ = TdS₁₂

b. An egg, initially at rest, is dropped onto the floor. Prove that this process is irreversible. You can assume that the egg returns to its initial temperature after it breaks.

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