OCR Gateway A C2.1.2 Empirical Formula Summary

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OCR Gateway A Chemistry and Combined Science revision summary on C2.1.2 – Empirical Formula for the higher and foundation tier. This is for the OCR Gateway course with first examinations in 2018.
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I really find ur vids hepful thanks sooo much

uthmanahmed
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does it matter which order the letters are on like can it be coh2 instead of ch2o

optemetrix