1 / 2

200 g q = cm T = 4.18 J/g ° C x 200 g x 29.0 ° C = 24 2 44 J or 24.2 kJ 24.2 kJ/0.66 g = 3 6 .7 kJ/g 3 6 .7 kJ/g

Data: 0.66 g, 29.0°C. 200 g q = cm T = 4.18 J/g ° C x 200 g x 29.0 ° C = 24 2 44 J or 24.2 kJ 24.2 kJ/0.66 g = 3 6 .7 kJ/g 3 6 .7 kJ/g x 352.77 g/mol = 1 2 958 kJ/mol or # mol= 0.66 g 352.77 g/mol=1. 8 7x10 – 3 mol 24.2 kJ/ 1. 8 7x10 – 3 mol = 1 2 958 kJ/mol

ojal
Download Presentation

200 g q = cm T = 4.18 J/g ° C x 200 g x 29.0 ° C = 24 2 44 J or 24.2 kJ 24.2 kJ/0.66 g = 3 6 .7 kJ/g 3 6 .7 kJ/g

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Data: 0.66 g, 29.0°C • 200 g • q = cmT = 4.18 J/g°C x 200 g x 29.0°C = 24244 J or 24.2 kJ • 24.2 kJ/0.66 g = 36.7 kJ/g • 36.7 kJ/g x 352.77 g/mol = 12958 kJ/mol or # mol= 0.66 g 352.77 g/mol=1.87x10–3 mol 24.2 kJ/1.87x10–3mol = 12958 kJ/mol • C25H52 + 38O2 25CO2 + 26H2O + 12958 kJ • The calorimeter is made up of more than just water (e.g. the metal from the can) Sources of error: 1) poor heat transfer (loss of heat, evaporation); 2) wax is a mixture of hydrocarbons so C25H52 is not entirely correct; 3) incomplete combustion. Not: experimental error, inaccurate thermometer

  2. Data: 0.65 g, 27.8°C • 200 g • q = cmT = 4.18 J/g°C x 200 g x 27.8°C = 23241 J or 23.2 kJ • 23.2 kJ/0.65 g = 35.8 kJ/g • 35.8 kJ/g x 352.77 g/mol = 12613 kJ/mol or # mol= 0.65 g 352.77 g/mol=1.85x10–3 mol 23.2 kJ/1.85x10–3mol = 12613 kJ/mol • C25H52 + 38O2 25CO2 + 26H2O + 12613 kJ • The calorimeter is made up of more than just water (e.g. the metal from the can) Sources of error: 1) poor heat transfer (loss of heat, evaporation); 2) wax is a mixture of hydrocarbons so C25H52 is not entirely correct; 3) incomplete combustion. Not: experimental error, inaccurate thermometer For more lessons, visit www.chalkbored.com

More Related