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A 10 mg effervescent tablet containing s...

A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid release 0.25 m l 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)`]

A

0.84

B

33.6

C

8.4

D

16.8

Text Solution

Verified by Experts

The correct Answer is:
C
`2NaHCO_(3) + H_(2)C_(2)O_(4) to Na_(2)C_(2)O_(4) + 2CO_(2) + 2H_(2)O`
Let mass of `NaHCO_(3)` be x mg
`n = 0.25/25000 = 10^(-5)`
`w = 84 xx 10^(-5) g`
`% (84 xx 10^(-5))/10^(-2) xx 100 = 8.4 %`
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