How much energy is required to heat 100.0 g H2O from a liquid at 20.0°C to a complete gas at 100 °C? The following physical data may be useful. ΔH vap = 40.7 kJ/mol; Cs,H2O = 4.18 J/g. °C

What quantity of heat is required to convert 49 g of ethanol (C₂H₅OH) at 23.0°C to a vapor at 78.3°C (its boiling point)? (heat capacity of ethanol = 2.46 J/g • C; ∆Hvap = 39.3 kJ/mol)

Calculate the energy released as heat when 18.7 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point. heat capacity of Hg(1) Constants for mercury at 1 atm melting point enthalpy of fusion 28.0 J/(mol-K) # 234.32 K 2.29 kJ/mol 9 = MacBook Pro

Using the information below, calculate how much energy (in kJ) is released when 12.0 g of water vapor at 113.0 ºC is cooled to 100 ºC and then condensed, GFM = 18.016 g/mol. Show all work and report you final answers to the correct units and significant figures. For H2O:  Cs = 2.03 J/(g·°C)     △Hfus = 6.02 kJ/mol                 Cl = 4.18 J/(g·°C)      △Hvap = 40.7 kJ/mol                  Cg = 2.0 J/(g·°C)

A 2.80−g sample of water is injected into an evacuated 6.00−L flask at 65.0°C. What percentage of water will be vapor when the system reaches equilibrium? Assume ideal behavior of water vapor and that the volume of liquid water is negligible. The vapor pressure of water at 65.0°C is 187.5 mmHg.

The amount of heat produced in an "ice calorimeter " is determined from the quantity of ice that melts, knowing that it takes 7.01 kJ of heat to melt exactly 1 mol of ice. Suppose that a 1.45-g sample of Al2O3(s) at 60.6 °C is dropped into an ice calorimeter. How many grams of ice will melt?

Two 20.0 g ice cubes at –16.0 °C are placed into 215 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature, T;, of the water after all the ice melts. heat capacity of H,O(s) 37.7 J/(mol·K) Tf = heat capacity of H,O(l) 75.3 J/(mol-K) enthalpy of fusion of H,O 6.01 kJ/mol

A pure sample of Substance S is put into an evacuated flask. The flask is then heated steadily and the temperature measured as time passes. The results are graphed below, in the middle (in green). Identical experiments are now run on Substance Y and Substance Z. Substance Y is just like S except that it has a higher heat capacity in the solid phase C₂ (s). Substance Z is just like S except that it has a lower enthalpy of vaporization H. Select the graphs below, on the left and right, that show the results you expect for these new experiments. Substance Y •C₁ (s)) (higher Cp (Drag the slider to choose an image) temperature (°C) Substance S added heat (kJ/mol) Substance Z (lower H₂) (Drag the slider to choose an image) ³ 5

What quantity of heat, in kJ, is required to convert 12.0 g of ethanol (C₂H₂OH) at 23.0°C to a vapor at 78.3°C (its boiling point)? (specific heat capacity of ethanol = 2.46 J/g C; AHvap = 39.3 kJ/mol) ●

What amount of heat (in kJ) is required to convert 10.8 g of an unknown liquid (MM = 83.21 g/mol) at 19.2 °C to a gas at 93.5 °C? (specific heat capacity of liquid = 1.58 J/g. °C; specific heat capacity of gas = 0.932 J/g⋅ °C; AHvap = 22.5 kJ/mol; normal boiling point, Tb = 57.3 °C)