A balanced equation is reduced to the lowest whole number coefficients.If there is only one mole or one atom, then the coefficient or subscript "1" is implied, but is not written. If the atom appears in more than one reactant or product, add together all the atoms on each side of the arrow. To calculate the number of atoms, multiply the coefficient and the subscript.Subscripts (numbers below an atom) indicate the number of atoms in a single molecule. Coefficients (number in front of a chemical formula) indicate moles of a compound.To write a balanced equation, the reactants go on the left side of the arrow, while the products go on the right side of the arrow.A balanced equation contains the same number of each type of atoms on both the left and right sides of the reaction arrow.In chemistry, it's important to be able to recognize when equations are balanced, when they are not balanced, and how to balance them.Remember that if there's no coefficient in front of an element, it's assumed that the coefficient is 1. Now the number of atoms in each element is the same on both sides of the equation, so the equation is balanced. To balance this, add the coefficient 2 before H2 on the left side of the equation so there are 4 hydrogen atoms on each side, like 2H2 + O2 → 2H2O. However, subscripts can't be changed and are always multiplied by the coefficient, which means there are now 4 hydrogen atoms on the right side of the equation and only 2 hydrogen atoms on the left side. For the equation H2 + O2 → H2O, you would add the coefficient 2 before H2O on the right side so that there are 2 oxygen atoms on each side of the equation, like H2 + O2 → 2H2O. To balance the equation, you'll need to add coefficients to change the number of atoms on one side to match the other. Since the number of atoms in each element isn't identical on both sides, the equation is not balanced. There are 2 hydrogen atoms and 1 oxygen atom on the right, so you would write "H=2" and "O=1" under the right side. For the equation H2 + O2 → H2O, there are 2 hydrogen atoms being added to 2 oxygen atoms on the left, so you would write "H=2" and "O=2" under the left side. For example, your equation should look something like "H2 + O2 → H2O." Count the number of atoms in each element on each side of the equation and list them under that side. To balance a chemical equation, first write out your given formula with the reactants on the left of the arrow and the products on the right. If the value you assigned returns coefficients that have a greatest common factor (GCF), simplify the chemical equation by dividing each value by the GCF.If there is only one fraction, multiply all values by that values denominator. If the value you assigned returns fractional values, just multiply all values by the least common multiple (LCM) of the denominators to get rid of the fractions.This shows us the values are as follows:.Since H: 2b = 3c + d, we can calculate b like this:.Then start solving the system of equations to get the following values: To quickly do this, take one variable and assign a value to it.You must find the one where every variable is in its smallest, non-fractional form. Since there are more variables than equations, there are multiple solutions. Solve this system of equations to get the numeric value for all the coefficients.
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