Which quantity or quantities must always be the same on both sides of a chemical equation?

Asked by maham237 @ 22/12/2020 in Chemistry viewed by 271 People

Which quantity or quantities must always be the same on both sides of a chemical equation? (a) the number of atoms of each kind (b) the number of molecules of each kind (c) the number of moles of each kind of molecule (d) the sum of the masses of all substances involved?

Answered by maham237 @ 22/12/2020

Explanation:

An equation that contains same number of atoms on both reactant and product side is known as a balanced chemical equation.

Also, mass of substances involved and formed in a chemical reaction will be equal.

For example, $2K + Cl_{2} \rightarrow 2KCl$

Number of K atoms on both reactant and product side are 2.

Number of Cl atoms on both reactant and product side are 2.

Therefore, this equation is balanced.

Also, mass of K = 39.09 g/mol, mass of Cl = 35.45 g/mol.

Sum of reactant molecules = $(2 \times 39.09 g/mol) + (2 \times 35.45 g/mol)$

= 149.08 g/mol

Sum of product molecules = $2 \times (39.09 g/mol + 35.45 g/mol)$

= 149.08 g/mol

Therefore, masses of atoms involved is same on both reactant and product side.

Thus, we can conclude quantity or quantities that must always be the same on both sides of a chemical equation are as follows.

the number of atoms of each kind.

the sum of the masses of all substances involved.

Which quantity or quantities must always be the same on both sides of a chemical equation?

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