Read the problem carefully and make sure you understand what it is asking.
Identify the known and unknown quantities in the problem.
Determine what information you have and what information you need to solve the problem.
Use your knowledge of chemistry concepts and formulas to set up an equation or series of equations that relates the known and unknown quantities.
Solve the equation(s) to find the solution to the problem.
Check your work and make sure the solution makes sense in the context of the problem.