Entropy Variation - System, Neighborhood and Universe

[jaumzaum]

I learned ΔS_univ = ΔS_sys + ΔS_neib

If ΔS_univ > 0 the process is spontaneous.

But ΔS = Q/T right? Shouldn't Q_sys = -Q_neib? (The heat released by the system = - heat released by the neighborhood)
I cannot understand why this is wrong!

If it were the case, ΔS_univ would be always zero

Can anyone help me?

[]`s
John

 

[DrDu]

$\Delta S=Q/T$ only for reversible processes.For irreversible processes, $\Delta S>Q/T$.