Chemistry Homework Help

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Heating and Cooling Curves

#### Q. Identify the point(s) on the following diagram where the removal of heat will cause some of the sample to freeze. Enter your answer in alphabetical order, e.g., DFJ not FDG.

Solved • Aug 26, 2019

Heating and Cooling Curves

#### Q. Click on the segment of the diagram where only the liquid is present.

Solved • Aug 26, 2019

Heating and Cooling Curves

#### Q. Identify the line segment on the following diagram where the specific heat of the solid is used to calculate energy flow. a) line segment F-H b) line segment A-B c) line segment H-J d)line segment D-F e) line segment B-D

Solved • Aug 26, 2019

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