For a closed system, the change in entropy for a reversible process is the change in entropy for an irreversible process between the same two states
a. greater than
b. less than
c. the same as

c. the same as

Explanation:

for a closed system:

⇒ ΔS > 0irreversible process

⇒ ΔSrev = ∫ dQ/T

for an irreversible process, ΔS is not the same as in a reversible process, since more than one reversible process is needed for the two ΔS to be equal.

⇒ ΔSirrev = ΔSrev1 + ΔSrev2 +

but if the initial and final states are the same, ΔS for an irreversible process can be calculated as if it were a reversible process.

⇒ ΔSirrev = ΔSrev