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A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of CO 2 at T = 298.15 K and p = 1 bar. If molar volume of CO 2 is 25.0 L under such condition, what is the percentage of sodium bicarbonate in each tablet ? [Molar mass of NaHCO 3 = 84 g mol –1 ]

1. 33.6
2. 0.84
3. 8.4
4. 16.8

Correct answer: 8.4

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