CHEM 1210 Lecture Notes - Lecture 19: Calorimeter, Molar Mass, Sodium Hydroxide

• School: Ohio State University
• Department: Chemistry
• Course: CHEM 1210
• Professor: Shiyu Zhang

Document Summary

Heat capacity: heat required to raise substance by 1 degree (refers to a specific species) Specific heat: heat required to raise temperature of a unit mass by one degree. (example: 1 gram of water by 1 degree) Cup calorimeter and bomb calorimeter measure reaction heat released. 6. 50g sample of naoh(s) dissolves in 100. 0 g of water in a coffee cup calorimeter the temperature rises form 21. 6 to 37. 8 degrees celsius. G= c s x m x change in t. Calculate the change in h in kj/ mol naoh for the dissolution. 6. 50 grams naoh > 7. 21 kj heat. Get the molar mass and put to moles. Divide 7. 21 by # of mol and get -44. 4 kj/mol. Because the reaction is exothermic, 7. 21 is actually -7. 21. Less mass in surrounding > greater temperature change. Change of enthalpy for the reaction that forms 1 mole of the substance from its elements in their most stable form with all reactants and products.