Which of the following is necessary to do a complete stoichiometric calculation?

write the mole ratio.
add the nuclear masses of the products.
divide the nuclear masses of the reactants.
write the number of atoms in one mole of the product.

Write the mole ratio.

Explanation:

The term stoichiometry is coined from two words: stoicheon(atom) and metron(measurement).

Stoichiometry uses the composition or chemical reactions of matter and the moles to quantity the elementary particles of a matter.

In order to do this, we use the mole ratio as the basis of the calculation. The mole is related to different parameters that we can obtained experimentally and theoretically about a reaction.  

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

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