What is the sensible heat of 1 kg of water at saturation temperature and a pressure of 900 kPa?

To determine the sensible heat of 1 kg of water at saturation temperature and a pressure of 900 kPa, it is necessary to refer to the properties of water and steam as defined in steam tables or thermodynamic property references.

At a pressure of 900 kPa, water is in a saturated state. The saturation temperature at this pressure is approximately 180.5°C. The sensible heat, also known as the sensible heat of liquid water, can be identified in the property tables, which provide specific enthalpy values for saturated water and steam.

The specific enthalpy of saturated liquid water (hf) at this pressure is approximately 742.83 kJ/kg. This represents the energy required to raise the temperature of the liquid water without changing its phase. Therefore, at the saturation temperature corresponding to 900 kPa, the sensible heat of 1 kg of water is indeed 742.83 kJ/kg.

This value is the key reason why the selected choice is accurate—it reflects the actual enthalpy of the saturated liquid under the given conditions and confirms the physical properties of water at that saturation point.