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Another way of writing this law is ' The Law of Conservation of Mass'.

It states that matter cannot be created nor destroyed in a chemical reaction.

So for a general chemical reaction

A + B = C + D

The total mass of of the two reactants A & B may br 35g + 20g = 55g

Then the total mass of the products C & D MUST equal 55g.

However, the masses of C & D may be 15g & 40 g = 55 g.

The total mass is preserved.

This leads on to BALANCING reaction equations. e.g.

HCl + Na2CO3 = NaCl + H2O + CO2

This is not a balamced reaction because you have lost matter, by way of losing a sodium (Na) , also you have created matter out of 'thin air' by creatimng a hydrogen(H).

One atom of sodium does Not have the samer mass as one atom of hydrogen. So the law of conservation of matter is not observed.

The correct BALANCED reraction eq'n is

2HCl + Na2CO3 = 2NaCl + H2O + CO2

You will find the same number of each type of atom on bothb sides of ther equation. So matter has been preserved.

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lenpollock

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1y ago

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