1. The problem asks for the specific heat capacity at constant pressure (cp) of steam. 2. Specific heat capacity at constant pressure, $c_p$, is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius (or Kelvin) at constant pressure. 3. For steam (water vapor), $c_p$ depends on temperature and pressure, but a common approximate value at 100°C and 1 atm is about $2.01 \ \text{kJ/kg} \cdot \text{K}$. 4. This value can be found in thermodynamic tables or steam tables used in engineering. 5. Therefore, the specific heat capacity of steam at constant pressure is approximately: $$c_p \approx 2.01 \ \text{kJ/kg} \cdot \text{K}$$ This means to raise 1 kg of steam by 1 K at constant pressure, about 2.01 kJ of heat is needed.