17.3 Heat in Changes of State

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Presentation transcript:

17.3 Heat in Changes of State

Vapor ___________________ Liquid ___________________ Solid ____________________ Heats of Fusion – Solidification and Vaporization – Condensation are know and they are molar

How many grams of ice at 0·C will melt if 2. 25 KJ of heat are added How many grams of ice at 0·C will melt if 2.25 KJ of heat are added? ∆Hfus = 6.01 kJ ∆H = 2.25kJ Can you write an equation for the process?

How many grams of ice at 0·C will melt if 2. 25 kJ of heat are added How many grams of ice at 0·C will melt if 2.25 kJ of heat are added? H20(s) + 6.01kJ → H20(l) ice with 6.01 kJ of heat will melt We are asked for how many grams will melt… How can you get grams to be your final unit?

H20(s) + 6.01kJ → H20(l) 1 mol ice 6.01 kJ What is the most specific info we have to start with? What units do we want our answer to be in?

H20(s) + 6.01kJ → H20(l) Massice = 225 kJ 1 mol ice 18.0 g ice 6.01 kJ 1 mol ice

H20(s) + 6.01kJ → H20(l) Massice = 225 kJ 1 mol ice 18.0 g ice = 6.74g 6.01 kJ 1 mol ice

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