Feb 25 lecture--thermochem pII

internal energy

• total energy in a reaction (E)

  • divided in two subcategories; heat energy and work energy

• deltaE= q+w

  • q=heat energy

    • q=m X C_s X deltaT

  • w=work energy

    • p is external pressure

      • w=-p(negative pressure) X deltaV(change in volume)

      • unit=atm*L

      • 1 atm*L=101.3 J

calculating work

• type of force acting against some force over some distanc