1 Select the Triggers tab, and then select New. 2  Set your time and frequency, and then select OK.  Open Windows Defender by clicking the Start button. In the search box, type Defender and then, in the list of results, click Windows Defender.
A. An empirical formula represent a molecule. B. an empirical formula gives the smallest whole number ratio of each type of atom in a MOLECULE. C. The molecular formula can be the same as the empirical formula in some situations. D. An empirical formula must be multiplied by an integer to obtain the molecular formula.
The empirical formula is the simplest whole-number ratio of atoms in the compound. For iso-octane, the empirical formula is C4H9. Notice that the molecular formula is twice that of the empirical formula. All molecular formulas are an integer multiple of the empirical formula for a compound. FYI: Many compounds in nature have the same empirical formula and even the same molecular formula even though they have vastly different properties.