1 year ago

What is the best definition of the enthalpy change Hr

1 answer:

5 0

Answer:

<em>The flow of thermal energy in a system, at constant atmospheric pressure AND at thermodynamic standard temperature and pressure.</em>

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Lithium bromide is a(n) ___________.

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Ionic compound

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2 years ago

What is the ratio of the magenta phenolphthalein concentration to the colorless phenolphthalein concentration ([magenta phenolph

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Answer:

$\frac{[magenta\ phenolphthalein]}{[colorless\ phenolphthalein]}=31.62$

Explanation:

Considering the Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution as:

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pKa of phenolphthalein = 9.40

pH = 10.9

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$10.9=9.40+\log\frac{[magenta\ phenolphthalein]}{[colorless\ phenolphthalein]}$

$\frac{[magenta\ phenolphthalein]}{[colorless\ phenolphthalein]}=31.62$

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Determine the number of grams of carbon-14 remaining in this sample at 17,100 years.

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