1000kg of steam is condensed back to water in the condenser of a power station each hour. The specific latent heat of vaporisation of water is 2260kJ/kg.Calculate the energy output to the environment this causes each second.

A mass of 0.063 kg of water was turned into steam.The specific latent heat of vaporisation of water is 2 260 000 J/kgCalculate the thermal energy transferred to the water to turn it into steam.Use the equation:thermal energy for a change of state = mass ×specific latent heatEnergy = ___________________________ J

(f)     While a kettle boils, 0.018 kg of water changes to steam.Calculate the amount of energy required for this change.Specific latent heat of vaporisation of water = 2.3 × 10 6 J / kg.

The heat of vaporization of water at 100°C is 40.66 kJ/mol. Calculate the quantity of heat that is released when 5.00 g of steam condenses to liquid water at 100°C. Hint: Convert 5.0 grams of water to moles (divide by the molar mass of H2O), multiply answer by the heat of vaporization.

A boiler delivers 5400kg of steam per hour at a pressure of 800kN/m2 and with a drynessfraction of 0.98. The feedwater to the boiler is at a temperature of 42oC. The fuel usedfor the boiler has a calorific value of 31000kJ/kg.(i) Determine the heat energy absorbed by the steam per hour in the boiler

A mass of 3 kg of saturated water vapour at 200 kPa is heated at constant pressure until the temperature reaches 250°C. Calculate the work done by the steam during this process. IMPORTANT INSTRUCTION: Put your answer in the text box up to two decimal places or as a whole number.