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help pls 9. How much NaCl would you weigh out to make 2000ml of a 0.5% solution? (gmw= 58.5g/mole) 10. How much 95% alcohol is

help pls

9. How much NaCl would you weigh out to make 2000ml of a 0.5% solution? (gmw= 58.5g/mole) 10. How much 95% alcohol is needed to prepare 475ml of 80% alcohol

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