Which of the following MUST be the same before and after a chemical reaction?
1. The total mass of the reactants and total mass of the products.
2. The number of molecules of each substance involved in the chemical reaction.
3. The number of atoms of each element involved in the chemical reaction.

A. 1,2,3 B. 1,3 C. 2,3 D.3

pls chose a,b,c or d pls send explaination if possible.

Question

06-12-2019
Chemistry

contestada

Which of the following MUST be the same before and after a chemical reaction?
1. The total mass of the reactants and total mass of the products.
2. The number of molecules of each substance involved in the chemical reaction.
3. The number of atoms of each element involved in the chemical reaction.

A. 1,2,3 B. 1,3 C. 2,3 D.3

pls chose a,b,c or d pls send explaination if possible.

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Diatonic254 Diatonic254 · Answer 1 · 2019-12-12T08:45:58+01:00

B

In a chemical reaction, the total mass of the reactants and total mass of the products and the number of atoms of each element involved in the chemical reaction MUST be the same.

Explanation:

The law of conservation of mass in thermodynamic states that mass cannot be destroyed or created in a closed isolated system. This law especially applies to chemical reasons because atoms are not split like in nuclear reactions. This is why chemical equations are balanced to ensure that the number of atoms of every element on both sides of the equation is the same. This ensures that the equation observed this law of thermodynamics. By balancing the moles on both sides of the equation, this ensures that there is equal the mass of the reactants and products because no mass was created or destroyed in the process.

Learn More:

For more on the laws of conservation of mass and energy check out;

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