Due to intermolecular H-bonding in ${{H}{2}}$O, extra energy in the form of heat is required to break these H-bonds due to which ${{H}{2}}$O boils at a higher temperature than ${{H}_{2}}$OS which does not have H-bonding.
Due to intermolecular H-bonding in ${{H}{2}}$O, extra energy in the form of heat is required to break these H-bonds due to which ${{H}{2}}$O boils at a higher temperature than ${{H}_{2}}$OS which does not have H-bonding.