Problem 46E
The extraction of Mn from pyrolusite with aluminum produces pure Mn metal and AI203 . Calculate the heat of reaction
Monday, August 28, 2017 Chemistry 2 Week 1 Notes - Thermodynamics- the study of energy • E=KE+PE - KE= kinetic energy - PE= potential energy - Thermochemistry- the study of chemical reactions and changes in energy - Thermal equilibrium- state of no energy flow from one point to another - Work- type of energy required to move an object w=Fd • - F= force • F=PA - P= pressure - A=area - d=distance • Work is typically in unit joules; it can be converted to atm*L using the conversion factor 101.32J/(l*atm) - Heat- energy exchanged between objects due to difference in temperatures • Heat can be measured using a calorimeter (device used to measure heat change) - State Function- property based solely on position/state; does not consider path followed to acquire the energy • Ex. Potential energy • Not state functions (functions that are path dependent): heat, work, internal energy - Potential Energy- energy in an object which depends on position of the object • PE=mgh - m= mass 1 Monday, August 28, 2017 - g= acceleration due to gravity - h= height • Electrostatic Potential Energy- the energy of a particle which stores chemical potential energy - Chemical Potential Energy- the result of electrostatic attractions between particles • PE= k(q1q2/2) - k= spring constant - q= charged particles • If q1 and q2 are the same sign, - T
