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17 solutions

Heating and Cooling Curves

Q. Given that q = n * ΔHfuss, how many moles of water are present if 53.5 kJ of heat are required to melt a sample of ice at 0°C? The heat of fusion of water is ΔHfuss = 6.010 kJ/mol.

Solved • Jul 18, 2019

Heating and Cooling Curves

Q. A sample of 58.90 g solid benzene at -2.2°C was heated until it absorbed 13.2 kJ of heat, at a constant pressure of 1 atmosphere. Using the data given in the table below, determine the final phase and final temperature of the benzene sample. Properties of Benzene: Value melting point: 5.49°C boiling point: 80.09°C heat of fusion at 5.49°C: 9.87 kJ/mol heat of vaporization at 80.09°C: 30.72 kJ/mol molar heat capacity of solid at 0°C: 118.4 J/mol*K molar heat capacity of liquid at 25°C: 136.0 J/mol*K molar heat capacity of gas at 95°C: 103.98 J/mol*K In tha final phase, the benzene sample will be a ___ and its final temperature will be ___ °C.

Solved • Jul 18, 2019

Heating and Cooling Curves

Q. Assume that the values given here for 1 mole of methanol are constant over the relevant temperature ranges. Given the heating curve for 1 mole of methanol beginning at 170 K and ending at 350 K answer the following questions: A.) What is the value of qsolid for methanol? Express your answer to two significant figures. B.)What is the value of qliquid for methanol? C.)What is the value of qgas for methanol? Express your answer to two significant figures.

Solved • Jul 3, 2019

Heating and Cooling Curves

Q. Sulfur dioxide is produced in enormous amounts for sulfuric acid production. It melts at -73.0°C and boils at —l0.0°C. Its [d]Hofus is 8.619 k/Jmol, and its [d]Hovap is 25.73 kJ/mol. The specific heat capacities of the liquid and gas are 0.995 J/g K and 0.1522 J/g ' K, respectively. How much heat is required to convert 6.250 kg of solid SO2 at the melting point to a gas at 60.0°C?

Solved • Jun 28, 2019

Heating and Cooling Curves

Q. From the data below. calculate the total heat [in J) needed to convert 30.00 g of ice at 4.25C to liquid water at 0.350C: m.p at 1 atm: 0.0C [d]Hofus:6.02kJ/mol c liquid: 4.184 j/g C c solid:2.09 j/g C

Solved • Jun 28, 2019

Heating and Cooling Curves

Q. How much heat in kJ, is required to convert 36.12 grams of water at 100°C to steam? (ΔHvap = 40.657 kJ/mol.)

Solved • Jun 24, 2019

Heating and Cooling Curves

Q. How much heat (in kJ) is required to convert 426 g of liquid H2O at 22.9°C into steam at 145°C? (Assume the specific heat of liquid water is 4.184 J/g°C, the specific heat of steam is 2.078 J/g°C, and both values are over the given temperature ranges. The normal boiling point of H2O is 100.00°C. )

Solved • Jun 24, 2019