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STEP 4: Now count the atoms again Hydrogen * Number of atoms in reactant = 2 * Number of atoms in product = 4 Oxygen * Number of atoms in reactant= 2 * Number of atoms in product = 2 Hydrogen is now unbalanced, so we place 2 in front of H2 We have: 2H2 + O2 -----------2H2O

STEP 5: FINAL ATOM COUNT Hydrogen * Number of atoms in reactant = 4 * Number of atoms in product = 4 Oxygen * Number of atoms in reactant= 2 * Number of atoms in product = 2 NOW THE EQUATION IS BALANCED

STEP 3: USE COEFFICIENTS TO BALANCE THE EQUATION A coefficient is a number placed in front of a chemical formula to adjust the number of atoms. The number of atoms is adjusted by changing the coefficients (not subscript) To balance Oxygen we place 2 in front of H20 We have: H2+ O2 ------ 2H2O

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NOTE: In the process of Balancing Oxygen, hydrogen has now become unbalanced. So we have to balance the hydrogen.

STEP 2: COUNT THE ATOMS OF EACH ELEMENT Count the number of atoms for each element on both sides of the equation Hydrogen * Number of atoms in reactant = 2 * Number of atoms in product = 2 Oxygen * Number of atoms in reactant= 2 * Number of atoms in product = 1 The oxygen atom is not balanced