What is meant by absolute entropy?

According to the second law of thermodynamics,which of the following is true for a spontaneous process?

The value of $\Delta S$ for freezing of $10 \ g$ of $H_2O_{(l)}$ (enthalpy of fusion is $80 \ cal/g$) at $0 \ ^\circ C$ and $1 \ atm$ pressure is.......$J/K$

The enthalpy of vaporization of benzene is $+35.3 \ kJ/mol$ at its boiling point,$80^{\circ} C$. The entropy change in the transition of vapour to liquid at its boiling point is

For an isolated system,$\Delta U = 0,$ what will be $\Delta S?$

In which of the following processes does entropy increase?