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Molecular Equation

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Chemical equation that explains how molecules interact with each other and come out with specific products either by exchanging the cations and anions or by simple combining under the influence of some catalysts give out an idea of molecular equation. 

Molecular equation makes sure that the reactants are engaged into some kind of chemical combination to come out with relevant products based on what the reactants are like. The physical states of the reactants are very important as that helps in combining in a specific manner.

Molecular Equation Definition

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Molecular equation emphasises the extent of exchanges that takes place in between the reactants and the conditions through which the molecules undergo such changes. The specific conditions that helps in ionic exchanges makes these chemical changes unique as they either follow specific reaction conditions or reaction standards required for the chemical change. 

Reaction conditions helps in maintaining the standard for the specific reaction throughout and the molecules undergo ideal changeover. These changeover are dependent on reaction standards and the ionic exchanges are specified by the cations and anions present on the reactant side. Same molecules might go for different product series if the reaction conditions are changed or managed in a different way. Chemical reactions are reactant specific and all the conditions which accompany such chemical changes plays a big role in determining the stages of chemical reactions.

A dilute form of acid might give hydrogen gas when reacted with metal but the concentrated form of the same acid might end up in oxidised form of hydrogen. Moreover, the molecular reactions also depend upon the reactivity series of both metals and non-metals.

Molecular Equation for HCl and NaOH

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The molecular equation between HCl and NaOH is based on neutralisation. Strong acid like HCl and a strong base like NaOH react with each other to form salt and water. The exchange of ions result in the formation of the respective salt and water. 

HCl + NaOH $\rightarrow$ NaCl + H2O

Balancing of skeletal reaction is not necessary as the number of atoms on both reactant side as well as product side are same and hence the moles of reactant as well as product remains as it is. 

Positively charged cation Na+ bonds with the negatively charged Cl- and gives out the expected salt NaCl. The formation of water takes place as the H+ ion makes bond with the hydroxyl ion (OH-). 

Molecular Mass Formula

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Molecular mass is basically the combined value taken into consideration after calculating each of the individual atomic mass present in a molecule. There is no formula as such to find out the molecular mass. The only thing one has to follow is to figure out the number of atoms of a specific species present in a molecule and then adding by the number with their individual atomic mass and finally adding all of these together.

For example, let us take into consideration the molecule of calcium carbonate (CaCO3

In calcium carbonate molecule, we can see the presence of one calcium atom, one carbon atom and three oxygen atoms.
Calcium atomic mass x 1 = 20 g
Carbon atomic mass x 1 = 12 g
Oxygen atomic mass x 3 = (16 * 3) = 48 g
Molecular mass is given out as (20 + 12 + 48) g = 80 grams

Let us look at another example. The molecule of Aluminium sulphate [Al2(SO4)3]
In the molecule of aluminium sulphate, there are 2 atoms of aluminium (Al), 3 atoms of Sulphur, and 12 atoms of Oxygen.
Aluminium (Al) = 2 * 23 = 46 grams
Sulphur (S) = 3 * 32 = 96 grams
Oxygen (O) = 12 * 16 = 192 grams
The molecular mass of [Al2(SO4)3] = 46 + 96 + 192 = 334 grams

Molecular Weight Formula

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The molecular weight and molecular mass defines the same idea of finding individual atomic mass and then add each of these to find out the final value. The main idea is to figure out the individual atoms present in the molecule and then multiply their atomic masses with their individual numbers present in the molecule. 

The final value comes out as the combined added atomic masses. 

Molecular Formula Equation

Molecular formula for two species (element) molecule is given out as 

(Atomic mass of species 1) * (number of atoms) + (atomic mass of species 2) * (number of atoms) = giving out the final combined value.