20. How many grams of water can be cooled from 35 to 20 °C by evaporation of 60 grams of water? (heat of vaporizati...
20. What is the total heat flow if 27 grams of steam at 143°C is cooled to become water at 34°C? The specific heat of water is 4.18 J/g. C; the specific heat of steam is 2.0 J/g. °C The heat of vaporization of water is 2.26 kJ/g, and the boiling point of water is 100°C 21. 75.0 mL of water is added to 12.9 mL of 0.250 M KMnO4 What is the concentration of the diluted solution? 22. Write...
How many grams of copper can be cooled from 66.8 to 20.3 °C by the heat gained by 100.0 g of water that has an increase in temperature from 24.7 to 33.6 °C? Answer in joules and in calories
32. An icemaker uses the heat change from evaporation of a refrigerant to freeze water. How many moles of the refrigerant CCI,F2 must be evaporated to freeze 209 g of water initially at 0°C to make ice at 0 °C? The heat of vaporization of CCI,F2 is 289 J/g. The heat of fusion of water is 334 J/g. A. 0.00 moles B. 1.00 moles C. 2.00 moles D. 3.00 moles E. 4.00 moles
Calculate the heat required in Joules to convert 18.0 grams of water ice at a temperature of -20° C to liquid water at the normal boiling point of water. Given: -specific heat of ice = 2.09 J/g°C -specific heat of liquid water = 4.184 J/g°C -specific heat of water vapor = 2.03 J/g°C -molar heat of fusion of water = 6.02 kJ/mol -molar heat of vaporization of water = 40.7 kJ/mol
How many grams of ethanol, C,H,OH, can be boiled with 971.0 kJ of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol. mass of ethanol:
If you have 300 grams of water at 100°C. How many kilojoules of heat are required to evaporate completely all the water? AHvap of water is 40.7 kJ/mole. O A. 678 kJ OB.133 kJ OC.12200 kg D. 0.133 kJ
16. If 1050 g of aluminum metal with a specific heat capacity of 0.902 g C at-20°C is placed in liquid water at 0.00 °C, how many grams of liquid water are frozen by the time that the aluminum metal has warmed to 10 °c? Heat of Fusion of water 333 16. If 1050 g of aluminum metal with a specific heat capacity of 0.902 g C at-20°C is placed in liquid water at 0.00 °C, how many grams of...
At 80° C, 60 grams of water is saturated with KCl. How many grams of KCl will crystallize when the solution is cooled to 45°C?
A 200 g aluminum calorimeter can contain 500 g of water at 20 C. A 100 g piece of ice cooled to -20 C is placed in the calorimeter. Find the final temperature of the system, assuming no heat losses. (Assume that the specific heat of ice is 2.0 kJ/kg K) A second 200 g piece of ice at -20 C is added. How much ice remains in the system after it reaches equilibrium? Would your answer to part b...
How much heat (in kJ) is released when 125.0 g of steam at 100.0°C is cooled to ice at -15.0°C? The enthalpy of vaporization of water is 40.67 kJ/mol, the enthalpy of fusion for water is 6.01 kJ/mol, the molar heat capacity of liquid water is 75.4 J/(mol ∙ °C), and the molar heat capacity of ice is 36.4 J/(mol ∙ °C).