EMPIRICAL FORMULA

• empirical formula is also known as the simplest formula in chemistry
• Empirical formula gives the smallest whole number ratio of elements in a compound using subscripts following element symbols.
• In some cases, the empirical formula is the same as the molecular formula, which gives the actual number of atoms in a compound (e.g., H 2 O).
• molecular formula - regular formula
• molecular formula - how many atoms of each element are in a compound
• empirical formula - the simplest or most reduced ratio of atoms in a compound
• In finding the empirical formula, if the decimal is 0.5, multiply it by 2. If the decimals are 0.33 and 0.66, multiply it by 3. And if the decimals are 0.25 and 0.75, multiply it by 4.
• SULFURIC ACID  is colorless, odorless, and extremely corrosive in nature. It has a wide variety of industrial uses, also used in petroleum refining to wash impurities of refinery products. 
• Many different compounds can all have the same empirical formula.
• If you're finding a formula from experimental data, you probably won't get perfect whole-number ratios.