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Propanoic acid is CH3CH2COOH. It has 3 carbons (3x12 = 36g), 2 oxygens (2x16 = 32 g) and 6 hydrogens (6x1 = 6 g). The total mass = 36+32+6 = 74g. Percent H = 6/74 (x100%) = 8.1%

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Q: How many percent of propanoic acid is hydrogen?
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