|Specific Heat, Molar Heat and Heat Capacity|
|The physical properties of a substance that concern its ability
to absorb heat without changing chemically are called its thermal properties.
Three examples are heat capacity, molar heat capacity, specific
heat capacity, which is usually just called specific heat.
|Specific Heat and Molar Heat Capacity|
|The specific heat of any substance is the energy needed to raise
the temperature of one gram of it by one degree Celsius. It can be calculated
by the equation
specific heat = (mass of sample in g) X (temperature change in oC)
|mathematically this is expressed as C =
|You should be able to rearrange the above equation into the other
3 possible equations.
|The easier equation to remember is E = mΔt. The energy
involved in joules is equivalent to the mass in grams times the specific
heat capacity of the substance times the change in temperature in degrees
|Table of Specific Heats|
|The molar heat capacity is a more useful quantity to work with
in chemistry. It is the energy required to raise one mole of any substance
by one degree Celsius.
|molar heat capacity = _ J_ _
|A useful relationship is
J X g
g oC mole mol oC
or specific heat X molar mass = molar heat capacity