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Advocard [28]
3 years ago
6

After you swallow, food travels from your mouth to your stomach. Through which organ does food pass between the mouth and the st

omach?
(A)large intestine

(B)esophagus

(C)bronchial tubes

(D)small intestine
Chemistry
2 answers:
Illusion [34]3 years ago
8 0
Your answer is B) the esophagus.
Your esophagus is located in your throat between your mouth and your stomach.
Andru [333]3 years ago
7 0

Answer:

B.

Explanation:

The Esophagus is a muscular tube that connects the pharynx to the stomach. The Esophagus contracts as it moves food into the stomach.

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343

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Aspirin is a weak organic acid whose molecular formula is HC9H7O4. An aqueous solution of aspirin is prepared by dissolving 3.60
garri49 [273]

Answer:

Ka = 3.50x10⁻⁴

Explanation:

First, we need to convert the unit of 3.60 g/L to mol/L:

C_{C_{9}H_{8}O_{4}} = 3.60 \frac{g}{L}*\frac{1 mol}{180.16 g} = 0.0200 mol/L

The reaction dissociation of aspirin in water is:

C₉H₈O₄  +  H₂O  ⇄  C₉H₇O₄⁻ + H₃O⁺    

0.02 - x                        x             x

The constant of the above reaction is:

Ka = \frac{[C_{9}H_{7}O_{4}^{-}][H_{3}O^{+}]}{[C_{9}H_{8}O_{4}]}

Ka = \frac{x^{2}}{0.02 - x}

To find Ka we need to find the value of x. We know that pH = 2.6 so:

pH = -log[H_{3}O^{+}]

2.6 = -log(x)

x = 2.51 \cdot 10^{-3} M = [H_{3}O^{+}] = [C_{9}H_{7}O_{4}^{-}]

Now, the concentration of C₉H₈O₄ is:

C_{C_{9}H_{8}O_{4}} = 0.02 - 2.51 \cdot 10^{-3} = 0.018 M

Finally, Ka is:

Ka = \frac{[C_{9}H_{7}O_{4}^{-}][H_{3}O^{+}]}{[C_{9}H_{8}O_{4}]} = \frac{(2.51 \cdot 10^{-3})^{2}}{0.018} = 3.50 \cdot 10^{-4}

Therefore, the Ka of aspirin is 3.50x10⁻⁴.

       

I hope it helps you!

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