Kimia
TERMOKIMIA
This time I wanted to post a little
about chemistry subjects that I had learned at schoolLEARN
thermochemicalThermochemicalDo you have difficulty in learning Thermochemistry
chapter? If you answer "Yes" then I think you are obliged to read the
continuation of this article. What about you who are working on the problems
lancer Thermochemistry? I think just continue reading this article, just maybe
you can add a reference, right tul he he he hehe.In my experience, there are
four main kinds of formulas that can be used to solve problems thermochemical,
namely:1. Formula CalorimeterQ = m. c.ΔT = C. . ΔTThis formula is often used
when we want to find the heat energy generated by mixing two solutions or to
locate thermal energy involved in the reaction performed withusing Calorimeter.
Examples of such questions as NaOH solution is mixed with a solution of H2SO4
and then we were told to look for heat neutralization, or a substance is burned
in Calorimeter then the heat generated is transferred to the water in
Calorimeter and we were told to look for heat burning substance.Oh yeah if
known specific heat (c) substances then use the formula Q = mc? T but if the
known heat capacity (C), then use the formula Q = C? T2. The formation enthalpy
formulaΔH = ΔH products - ΔH reactantsThis formula is used when we are told to
look for in terms of the enthalpy of a reaction and is known enthalpy of
formation data of each species in the reaction. Examples of the type of problem
with the completion of this formula is as follows:"Calculate the enthalpy
of the reaction A + B -> C + D if known enthalpy of formation of A = .... KJ
/ mol, B = ... KJ / mol, C = ... KJ / mol and D = ... KJ / mol"3. Formula
Energy AssociationTermination ΔH = ΔH - ΔH formationThis formula is used to
solve the problems known to bond breaking energy data / data bond formation. An
example of this problem is as follows:"Calculate the reaction CH4 + O2
-> CO2 + H2O if known CH bond energy data = ... KJ, O = O = ... KJ, KJ HO =
... and so on."4. Formula seeking reaction enthalpy legal basis
HessProblems like these mark the completion of the data is that there is a
reaction, and finally we were told to look for a specific reaction enthalpy.
His way is to reorganize existing reactions so that if these reactions are
summed amaka we will get a reaction in question. Example because is has the
following characteristic:"Calculate the enthalpy of the reaction A + E
-> B + F if known;A + D -> C + B ΔH = ... KJ / molB + D -> M ΔH = ...
KJ / molE + F -> C + D ΔH = ... KJ / mol "Well to keep in mind here is
that the enthalpy data is written in the book is in units of KJ / mol, for
example, the enthalpy of formation of CO2 is ΔH = -394 KJ / mol, this means the
formation of 1 mole of CO2 would release as much energy as KJ 394. If in
question being asked as 0.5 mol, 2 mol, or 3 moles then of course you have to
convert it first large enthalpy.
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