# coefficients in a chemical equation express between molecules or compounds

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## Coefficients in a chemical equation express between molecules or compounds

First: the coefficients give the number of molecules (or atoms) involved in the reaction. In the example reaction, two molecules of hydrogen react with one molecule of oxygen and produce two molecules of water. Second: the coefficients give the number of moles of each substance involved in the reaction.

## Coefficients in a chemical equation express _____ between molecules or compounds. coefficients in a chemical equation express between molecules or compounds

## What is a coefficient in a chemical equation?

In Chemistry the coefficient is the number in front of the formula.
The coefficient tells us how many molecules of a given formula are present.

#### Explanation:

Like Algebra the Coefficient is the number in front of the variable terms.

4x2y The coefficient is 4

In Chemistry the coefficient is the number in front of the formula.
The coefficient tells us how many molecules of a given formula are present.

2H2O means we have 2 molecules of water

In the balanced chemical equation for Ammonia

N2+3H22NH3

We know we have coefficients of
1 for N2
3 for H2
and
2 for NH3

It takes 1 molecule of N2 with 3 molecules of H2 to produce 2 molecules of NH3 The subscripts tell you how many atoms of a particular element are in a compound. The coefficient tells you about the quantity, or number, of molecules of the compound.

## How to Write Balanced Chemical Equations

Even though chemical compounds are broken up and new compounds are formed during a chemical reaction, atoms in the reactants do not disappear, nor do new atoms appear to form the products. In chemical reactions, atoms are never created or destroyed. The same atoms that were present in the reactants are present in the products—they are merely reorganized into different arrangements. In a complete chemical equation, the two sides of the equation must be present on the reactant and the product sides of the equation.

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### Coefficients and Subscripts

There are two types of numbers that appear in chemical equations.

There are subscripts, which are part of the chemical formulas of the reactants and products;

and there are coefficients that are placed in front of the formulas to indicate how many molecules of that substance is used or produced.

The subscripts are part of the formulas and once the formulas for the reactants

and products are determined, the subscripts may not be changed.

The coefficients indicate the number of each substance involved in the reaction and

may be changed in order to balance the equation.

The equation above indicates that one mole of solid copper is reacting with two moles of aqueous silver nitrate to

produce one mole of aqueous copper (II) nitrate and two atoms of solid silver.

### Balancing a Chemical Equation

Because the identities of the reactants and products are fixed, the equation cannot be balanced by changing the subscripts of the reactants or the products. To do so would change the chemical identity of the species being described.

The simplest and most generally useful method for balancing chemical equations is “inspection,” better known as trial and error. The following is an efficient approach to balancing a chemical equation using this method.

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