A frictionless piston-cylinder device contains \(1 \mathrm{~kg}\) saturated liquid at \(110^{\circ} \mathrm{C}\). The water in the cylinder is heated at \(420^{\circ} \mathrm{C}\) by bringing the assembly into contact with a body until the water is completely converted into saturated vapour at constant pressure. Determine the change in entropy, given that the latent heat of vaporization \(=2256.94 \mathrm{~kJ} / \mathrm{kg}-\mathrm{K}\).