Consider the phase diagram of carbon. If you heat a sample of graphite at a constant pressure of 1 atm, to what phase does it transform?   If you compress a sample of graphite at 2000ºC, to what phase does it transform?

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instant pan pressure cooker has an enthalpy of vaporization of water 40.67 kJ/mole. calculate the boiling temperature C of water inside a pressure pan cooker that has been pressurized to 5.9 atm.

A 124.0 gram sample of an unknown substance (MM = 189.50 g/mol) is cooled from 233.0 \deg C to 147.6 \deg C. ( heat capacity of liquid = 1.62 J/g. \deg C; heat capacity of gas = 1.04 J/g. \deg C; AHvap = 78.11 kJ/mol; normal boiling point, Tb = 160.3 \deg C) How much energy (in kJ) is absorbed/released to condense the gas?

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

Q6) A liquid is placed into a sealed vial and set on the benchtop to equilibrate at room temperature (25.0° C), and the vapor pressure is measured to be 400. torr. The flask is then heated to 42.0° C, with a new vapor pressure being measured to be 760. torr. What is the enthalpy of vaporization (in kJ/mol) for the liquid? a) 26.3 kJ/mol b) 29.5 kJ/mol c) 330 kJ/mol d) 0.98 kJ/mol

A copper block with an initial temperature of 12 °C is dropped into 577g of water initially at 77 °C, and they reach an equilibrium temperature of 65 °C. Determine the mass of the copper block.

How much heat energy is required to convert 77.6 g of solid iron at 21 °C to liquid iron at 1538 °C? The molar heat of fusion of iron is 13.8 kJ/mol. Iron has a normal melting point of 1538 °C. The specific heat capacity of solid iron is 0.449 J/(g · °C). q= kJ

Calculate the amount of heat (in kJ) required to raise the temperature of a 86.0 g sample of ethanol from 198.0 K to 300.0 K. The specific heat capacity of ethanol is 2.42 J/g°C. 60.0 kJ 21.2 kJ 11.9 kJ 75.6 kJ 28.4 kJ

A certain liquid has a vapor pressure of 92.0 Torr at 23.0 °C and 400.0 Torr at 45.0 °C. Calculate the value of AHvap for this liquid. AHvap = 52.3 Calculate the normal boiling point of this liquid. boiling point: 52 kJ/mol °C