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The law of conservation of mass. We now know that technically it's not quite true, but it's so close that the difference cannot be detected on the most sensitive balances we have.

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13y ago
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9y ago

The law in question is 'The Law of Definite Proportions'.

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11y ago

The law of conservation of matter, which states that matter can neither be created nor destroyed in a chemical reaction or a physical change.

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14y ago

Law of Conservation of Mass/Matter

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11y ago

Law of conservation of mass

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Q: What law states that the total mass of the reactants always equals the total mass of the products?
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If the total mass of the products of a reaction is 250g what was the total mass of the reactants?

The 1st Law of Thermodynamics states that matter, and thus energy, cannot be created or destroyed; it can only be converted to different forms. To answer your question then, the mass of the products should always equal the mass of the reactants.


In what system can reactants exist in the same physical states?

Heterogeneous Equilibrium


Do the products in a chemical reaction have the same prperties as the reactants?

In a chemical change chemical properties often change (like a substance's melting point or it's reactivity). In a physical change the materials have the same properties (a physical change would be like crushing rocks into sand). You can take wood, grind it into saw dust, but it is still wood. But if you burn it, the wood goes through a chemical change with the oxygen in the air and most of it is broken down into a gas (smoke) and the solid of which is left behind has a very different flammability property. (Suit, it doesn't burn.)


What symbolic representation of a chemical reaction?

There are several things that may symbolize a chemical reaction. One of the main symbols is a chemical equation which will represent the entities in the reaction. .


How does the Law of conservation relate to the reactants and products in a chemical reaction?

The law of conservation of mass states that matter is neither created nor destroyed in a chemical reaction (in a nuclear reaction it is a different matter). Therefore the total mass of the reactants equals the total mass of the products. This law is hard to grasp by some since some reactions are gas creating reactions, and most reactions occur in open systems; Therefore, the gas escapes and cannot be weighed properly, but mass is still conserved.

Related questions

In a balanced chemical reaction the total mass of the products always equals the total what?

In a balanced chemical reaction the total mass of the products always equals the total mass of reactants; this is the law of mass conservation.


What states that the reactants mass equals products mass?

This is the general law of mass conservation.


Who established that the total mass of the products is always equal to the total mass of the reactants?

The French chemist Antoine Lavoisier first proposed the law of conservation of mass which states the total mass of the products is always equal to the total mass of the reactants.


When hydrogen and chlorine mix together does the mass change?

No, due to the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the products equals the mass of the reactants.


What is the full law of conservation of mass?

Law of Conservation of Mass/Matter states that in a chemical reaction, matter is neither created nor destroyed. This means that whatever is in the reactants is also in the products, but the atoms have been rearranged. The mass of the reactants equals the mass of the products. This is why chemical equations must be balanced.


In a heterogeneous equilibrium system the reactants and products exist in what?

Different physical states


If the total mass of the products of a reaction is 250g what was the total mass of the reactants?

The 1st Law of Thermodynamics states that matter, and thus energy, cannot be created or destroyed; it can only be converted to different forms. To answer your question then, the mass of the products should always equal the mass of the reactants.


What is the law of conservation in mass?

The law of conservation of mass states that matter cannot be created or lost in a chemical reaction. The weight of the reactants will ALWAYS equal the weight of the products.


In a chemical reaction how does the total mass of the reactants compare to the total mass of the products?

The mass of the reactants compare to the mass of the products in that they are equal. The law to conservation of mass states that mass cannot be createdor destroyed. It can only be altered which would be a case in a chemical reaction.


How much matter is lost during a chemical changes?

No matter is lost during a chemical change. The mass of the products equals the mass of the reactants. The law of conservation of matter/mass states that in a closed system, matter is neither created nor destroyed.


Who states that during a chemical reaction the products weigh as much as the reactants?

I expect you mean Antoine Lavoisier. Please see the link.


Why physical states of reactants and products are mentioned while writing a chemical equation?

It is not obligatory but it is important as indication for other chemists or students.