CHEM 130 Lecture Notes - Lecture 25: Heat Capacity, Calorimetry, Enthalpy
Document Summary
Concept check: calculate the enthalpy change when 1 g methane is burned in excess oxygen at constant pressure: (7. 3) calorimetry. Clicker: the heat to raise the temperature of 1 g of cr by 1 degree c is called its: heat capacity, speci c heat capacity, calorimetry, enthalpy, molar heat capacity. Heat capacity (c) of a substance de ned heat absorbed over the increase in temperature units: j/ celsius. Speci c heat capacity (s): energy required to raise the temperature of one gram of substance by. Molar heat capacity: energy required to raise the temperature of one mole of substance by 1 c units: j/ c x mol. Heat of reaction: using heat capacity: q= c t. Dissolving cacl2: water > 17 c to 50 c. Cacl2 (s) > ca 2+ (aq) + 2cl- (aq) water is part of the surrounding because it is surrounding the chemical reaction.
2 MgO(s) āH = -1204 kJ