In its wisdom Word makes an educated guess about what you want the formula to do and places a formula in the Formula box. Type in your equation. It is easy to insert and use formulas.
Open your Word processor.
Microsoft Word is the best tool for writing and formatting text for your academics. It is designed for math but works okay for chemistry. The years of writing just some bad-looking arrows are over note that for some recent versions of MS Word the combination that works is ALT C instead of ALT X. Just switch to Insert tab and click Equation Insert New Equation to toggle on Equation Tools.