In the chemical reaction below ,sodium (Na) and chlorine (CI) combine to form sodium chloride (NaCI). 2Na + CI2 —> 2NaCI
The combined mass of the starting reactants is 50 grams what is the total mass of sodium chloride formed when the reaction is complete?

when reaction is completed the mass of sodium chloride is also 50g.

Explanation:

If we have 50 gram reactant after the completion of reaction we must have 50 gram of product because,

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given reaction:

Cl₂ +  2Na  → 2 NaCl

 50 g                  50 g

The mass on left side is 50 gram it must be 50 gram on right side,

Consider another example:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass

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