: Never write a number down without its units (e.g., g/molg/mol mol/dm3mol/dm cubed
A bottle read: “0.2 mol/dm³ HCl, 250 cm³.” How many moles?
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). Units serve as a roadmap to ensure your algebra is correct. : Never write a number down without its units (e
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Final challenge: Two routes to make ethanol. Route A: 100% atom economy (all atoms in reactants → product). Route B: 60% atom economy (waste products).