Using english to : CALCULATE



       


    

1. Defenition :

      
  •     to find (a number, answer, etc.) by using mathematical processes.  to get a general idea about the value, size, or cost of (something).
  •   So The definition of calculate is to use reason or common sense to determine something, or to use math to determine an answer.

Note :  

"Stoichiometry calculations are based on the fact that atoms are conserved. They cannot be destroyed or created. Numbers and kinds of atoms before and after the reactions are always the same. This is the basic law of nature".


     Origin of calculatevv

    from Classical Latin calculatus, past participle of calculare, to reckon ; from calculus, pebble, stone used in doing arithmetic, diminutive of calx, limestone: see calciulate 

a. to make a computation
b. to rely or depend (on)


           Examples of calculate 

                  in a sentence


  1. calculate the volume of a cylinder: 
  2. I need to calculate how long it will take me to drive to Chicago.
  3. We calculated the cost of new carpeting for the whole house.
  4. We need to calculate our chances of success before we invest more money in the business.

CALCULATE OF STOICYOMETRY




 1. Defenition :
    
Stoichiometry is the calculation of relative quantities of reactans and products in chemical reactions.
      
     A stoichiometric amount or stoichiometric ratio of a reagent is the optimum amount or ratio where, assuming that the reaction proceeds to completion:

  1. All of the reagent is consumed
  2. There is no deficiency of the reagent
  3. There is no excess of the reagent.



Example :

1. Problem :

What volume of oxygen at S.T.P. is needed for the complete combustion of 2 dm3 of propane ()? (Hint:  and  are the products in this reaction (and in all combustion reactions))

Answer :


Write the balanced equation

Find the ratio

Because all the reactants are gases, we can use the mole ratios to do a comparison. From the balanced equation, the ratio of oxygen to propane in the reactants is .

Find the answer

One volume of propane needs five volumes of oxygen, therefore 2 dm3 of propane will need 10 dm3of oxygen for the reaction to proceed to completion

Komentar

  1. Wahyu Mujiasih22 Mei 2017 pukul 18.29

    How to determine theoretical calculations?

    BalasHapus
  2. Unknown22 Mei 2017 pukul 18.36

    CALCULATING THEORETICAL PRICE RIGHT ISSUE

    Because rights are right (not a liability). Not kewahiban here we mean, ivestor does not have to redeem the right. Your rights will be lost? Not because you can sell it in the regular market before the right time broke.

    Suppose you have XYZ shares of 1000 lots (1lot = 500 shares). The result of the GMS decides that the issuer of XYZ has a right issue. And issued a 4: 1 ratio at the price of Rp. 100. That is, from 1000lot of shares owned, investors only get right quota of 250lot.

    BalasHapus
  3. Arifahrachel22 Mei 2017 pukul 20.45

    Do you mean the reagent is the same as the reactant? Then what does it do?

    BalasHapus
  4. Fania devika della23 Mei 2017 pukul 06.51

    why there is no excess of the reagent?

    BalasHapus
    Balasan
    1. Unknown23 Mei 2017 pukul 23.59

      In many analytical procedures, the analyte has more than one oxidation state and must be converted to a single oxidation state before titration. The redox reagents used in the preliminary reaction must be able to convert the analyte rapidly and completely into the desired oxidation state. The advantages of this reagent are usually added and we should be able to remove the excess so that the excess excess does not react with the titrant in the next titration

      Hapus
  5. Unknown25 Mei 2017 pukul 07.09

    How to determine the volume of the reactant gas and the reaction product?

    BalasHapus
  6. shabrina26 Mei 2017 pukul 22.13

    please explain There is no excess of the reagent.


    BalasHapus

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