Step-by-step super-easy method to calculate reacting masses using the “All My Methods Rule” mnemonic (it’s good, because it’s a mnemonic and IT’S TRUE! All my methods do rule!)
Tips: divide going down the table, multiply going up. Take the ratios from the balanced equation. Keep your calculated values on your calculator. Easy peasy.
Clarification: the first part became “amount” rather than mass or similar because I started using this under the old specification when students had to calculate empirical formula from both masses and percentages. So “amount”, despite being a vague term, fitted better. Also, Mr is used interchangably with Ar of course (please excuse the formatting).
This mnemonic can be used as a jumping-off point for most of the chemistry calculations. To calculate balanced equations from masses given, just go down both columns then calculate the ratios (divide by the smallest number).
Disclaimer: I can’t remember if I made up the “All My Methods Rule” mnemonic myself, or if I pinched it from someone many years ago. So sorry if I pinched it from you!
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