Position the cursor where you want to insert the formula. To install this download. How to Insert Mathematical Formulas and Symbols in Word Method 1.
Use the equation feature designed for math but works okay for chemistry.
Follow the instructions on the screen to complete the installation. Click the button with the three dots in the bottom right corner of the question box and select Math. Word and click the Insert tab then you see the corner of the page two options which you need them for your documents. Repeat the above steps and click Ink New Equation in the drop-down list of Equation button.