### Which Equation Obeys The Law Of Conservation Of Mass?

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• 8 Balanced chemical equation A balanced chemical equation obeys the law of conservation of mass.

## What is the law of Conservation of mass in balancing chemical equations?

A balanced chemical equation always obeys law of conservation of mass. According to this law the mass of products must be equal to the mass of reactants. A reaction is said to be balanced when the total mass of atoms on both sides of the chemical reaction is equal. Why is the law of conservation of mass important in balancing chemical equations?

## What is the law of Conservation of energy?

Law of Conservation of Mass Examples – According to the Law of conservation of mass- the number of atoms participating in a chemical reaction to form new products must be the same, i.e. the number of atoms on the reactant must always be equal to the number of atoms on the product side.  In this case, the total mass of the reactants $$=$$ is the total mass of the products. Also, the number of atoms of oxygen and hydrogen in the reactants side and the products side are equal.2. Carbon combines with oxygen in a $$2:1$$ ratio to form two moles of carbon monoxide.  In this case, the total mass of reactants and products also are equal. The number of atoms at the beginning and the end is equal as well.3. Hydrochloric acid reacts with sodium hydroxide in a $$1:1$$ ratio to form one mole of sodium chloride and one mole of the water molecule.  The Law of conservation of energy is similar to that of the Law of conservation of mass. According to the Law of conservation of energy, the total energy of a closed system (a system isolated from its surroundings) is conserved. This means energy can neither be created nor be destroyed. Example of Energy Transformation

• The amount of Energy in any system is given by:
• $$}_ }} } }_ }} }$$
• $$}_ }}$$ is the total Energy of a system$$}_ }}$$ is the initial Energy of a system$$}$$ is the heat added or removed from the system
• $$}$$ is the work done by or on the system

The law of conservation of mass and the law of conservation of energy was later amended by Einstein as the Law of conservation of mass energy, which describes that the total mass and energy in a closed system remains constant. Hence mass and energy can be converted from one form to another.

## What is a balanced chemical equation?

Derivation of Conservation of Momentum – According to Newton’s Third Law, when a force is applied by object $$}$$ on object $$}$$, then object $$}$$ exerts back an equal and opposite force on object $$}$$. This idea was the underlying principle behind the Law of conservation of momentum.

1. Let us consider two particles, $$}$$ and $$}$$, with masses $$}_ }}$$ and $$}_ }}$$ colliding with each other at time $$}$$.
2. Change in momentum of particle $$} }_ }}\left( }_ }} } }_ }}} \right)$$Change in momentum of particle $$} }_ }}\left( }_ }} } }_ }}} \right)$$
3. Where, $$}_ }}}$$ and $$}_ }}}$$ are the initial and final velocities of $$}$$ and $$}_ }}}$$ and $$}_ }}}$$ are the initial and final velocities of $$}$$.
4. According to Newton’s Third Law-
5. $$}_ }}} } }_ }}}$$
6. $$}_ }}} } }_ }} } }_ }} }\frac }_ }}\left( }_ }} } }_ }}} \right)}} }}$$
7. $$}_ }}} } }_ }} } }_ }} }\frac }_ }}\left( }_ }} } }_ }}} \right)}} }}$$
8. Applying Newton’s third law we get,
9. $$\frac }_ }}\left( }_ }} } }_ }}} \right)}} }} }\frac }_ }}\left( }_ }} } }_ }}} \right)}} }}$$
10. $$}_ }}\left( }_ }} } }_ }}} \right) } }_ }}\left( }_ }} } }_ }}} \right)$$
11. $$}_ }} }_ }} } }_ }} }_ }} } }_ }} }_ }} } }_ }} }_ }}$$
12. $$}_ }} }_ }} } }_ }} }_ }} } }_ }} }_ }} } }_ }} }_ }}$$
13. The above equation is the Law of conservation of momentum, where $$}_ }} }_ }} } }_ }} }_ }}$$ is the total momentum of particles $$}$$ and $$}$$ before the collision and $$}_ }} }_ }} } }_ }} }_ }}$$ is the total momentum of particles $$}$$ and $$}$$ after collision.

Chemical reactions are usually expressed in terms of chemical equations where reactants change to form products. Chemical equations are the shorthand representation of a chemical reaction in terms of atoms and molecules. In a chemical equation, the number of atoms reacting is always equal to the number of atoms formed.

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This means the right and left sides of the arrow in a chemical equation should have an equal number of atoms resulting in a balanced chemical equation. A balanced chemical equation is based on the Law of conservation of mass proposed by Antoine Lavoisier. Through this article, we learned the statement, concept and examples that govern the Law of conservation of mass.

We also learned the Law of conservation of mass energy, Law of conservation of momentum and its formula.

#### What is the law of Conservation of momentum?

Frequently Asked Questions – Q.1. What does the law of conservation of mass mean?Ans: The law of conservation of mass means that the mass of an isolated system always remains constant. It is neither created nor destroyed by chemical reactions or by physical transformations.Q.2.

Who proposed the law of conservation of mass?Ans: The French chemist Antoine Lavoisier proposed the law of conservation of mass in $$1789$$.Q.3. Why there is no change in mass during chemical reactions?Ans: There is no change in mass during chemical reactions because atoms can neither be created nor be destroyed during the course of a chemical reaction.

A rearrangement of atoms or a group of atoms of reactants occurs to form products. The number of atoms and mass of the reacting species remains constant.Q.4. State the law of conservation of mass and energy.Ans: The law of conservation of mass and energy describes that the total mass and energy in a closed system remains constant and can only be converted from one form to another.Q.5.

• If energy is neither created nor destroyed, what is the ultimate source of Energy?Ans: The ultimate source of all forms of energy is the Sun.
• Energy in the universe is neither created nor destroyed.
• It is only converted from one form to another.
• For example, the energy possessed by a falling apple is converted from potential energy to kinetic energy.

Similarly, when a bulb glows, electrical energy is converted to heat and light energy. We hope this article on the Law of Conservation of Mass has helped you. If you have any queries, drop a comment below, and we will get back to you. : Law of Conservation of Mass: Definition, History, Formula, Examples

## What is the equation for the law of conservation?

Which equation states the law of conservation of energy? The equation expressing conservation of energy is: KEi+PEi=KEf+PEf. If you know the potential energy for only some of the forces, then the conservation of energy law in its most general form must be used: KEi+PEi+Wnc+OEi=KEf+PEf+OEf, where OE stands for all other energies.

#### How can we prove the law of Conservation of mass?

When balancing chemical equations, the law of conservation of mass is also demonstrated because the total number of atoms that goes into the reaction must be produced. So if 14 atoms are on the reactant side, then 14 atoms must be on the product side. Equations often require balancing to correctly demonstrate the law of conservation of mass.

## How to solve law of Conservation of mass problems?

Balancing Chemical Equations – A balanced chemical equation is one that demonstrates that atoms, like mass in general, are neither created nor destroyed during the reaction, which an equation describes. Balancing a reaction equation is one way of solving a conservation of mass problem. To do this, you recognize that both sides of the equation contain the same number of atoms of each element involved in the reaction. For example, the unbalanced equation for rust formation, which is a combination of iron with oxygen to produce iron oxide, looks like this: Fe + O 2 -> Fe 2 O 3 This equation isn’t balanced because the two sides contain different numbers of iron and oxygen atoms. To balance it, multiply each of the reactants and the products by a coefficient that produces the same number of atoms of each element on both sides: 4Fe + 3O 2 -> 2Fe 2 2O 3 Note that the number of atoms in a compound, represented by the subscripts in a chemical formula, never changes. You can only balance an equation by modifying coefficients.

## What are facts about the law of Conservation of mass?

The law of conservation of mass states that in a closed system, the mass of the system cannot change over time. Look at our example of the candle in the closed room. Though much of the wax itself is no longer present in its original form, all of the mass of the wax is still present in the room, albeit in a different form.