How many electrons are there in 100 kg of H2O?
During my chemistry studies, I recall my teachers reminding us many times to ‘Keep track of your units’. They had good reason, as mistakes with units account for a lot of lost marks in A-level chemistry exams.
Units may sound like a simple topic, but they are important and useful in all science and maths studies. I’d like to share a technique to keep on top of units, which I used at A-level and beyond. The key is to write down all the steps as you work out an answer, so you are less likely to make careless errors.
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