Chemistry Homework Help

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Heating and Cooling Curves

#### Q. The heat of vaporization of water is 40.6 kJ/mol. How much heat energy is required to convert 1.00L of water to steam?

Solved • Feb 4, 2020

Heating and Cooling Curves

#### Q. What amount of heat (in kJ) is required to convert 20.6 g of an unknown solid (MM = 83.21 g/mol) at -5.00 °C to a liquid at 52.3 °C? (heat capacity of solid = 2.39 J/g･°C; heat capacity of liquid = 1.58 J/g･°C; ∆Hfus = 3.72 kJ/mol; Tf = 10.3°C)

Solved • Feb 4, 2020

Heating and Cooling Curves

#### Q. How much heat is required to heat 2 grams of ice at -30°C to steam at 100°C. Use the approximate values below for your calculations: Cice = 2 J g^-1°C^-1 ΔHfus = 340 J g^-1 Cwater = 4 J g^-1 °C^-1 ΔHvap = 2260 J g^-1 Csteam = 2 J g^-1 °C^-1 a) 1.60 kJ b) 6.12 c) 6.00 kJ d) 6120 kJ

Solved • Jan 28, 2020

Heating and Cooling Curves

#### Q. How much energy is required to convert 35.0 g of water at 27.5 oC to steam at 155.0 oC?

Solved • Jan 27, 2020

Heating and Cooling Curves

#### Q. When a solid is placed in a container and heat is applied, a phase change occurs. Watch the video and identify which of the following statements are correct. Check all that apply.

Solved • Jan 22, 2020

Heating and Cooling Curves

#### Q. In the video, you can see that as heat is applied to a solid, it is converted into the liquid phase and then into the gas phase. This process can be studied by plotting the graph of temperature versus the time during which heat is applied to the system. Identify the states of matter and the processes that occur at each of the positions on the graph. Drag the appropriate labels to their respective targets.

Solved • Jan 22, 2020

Heating and Cooling Curves

#### Q. How much heat energy, in kilojoules, is required to convert 48.0 g of ice at -18.0 °C to water at 25.0 °C? Express your answer to three significant figures and include the appropriate units.

Solved • Jan 22, 2020