What is the density of lead (in g/cm^3 3 ) if a rectangular bar measuring 0.500 cm in height, 1.55 cm in width, and 25.00 cm in
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<u>Answer:</u> The pH of acid solution is 4.58
<u>Explanation:</u>
To calculate the number of moles for given molarity, we use the equation:
.....(1)
- <u>For KOH:</u>
Molarity of KOH solution = 1.1000 M
Volume of solution = 41.04 mL
Putting values in equation 1, we get:
- <u>For propanoic acid:</u>
Molarity of propanoic acid solution = 0.6100 M
Volume of solution = 224.9 mL
Putting values in equation 1, we get:
The chemical reaction for propanoic acid and KOH follows the equation:
<u>Initial:</u> 0.1372 0.04514
<u>Final:</u> 0.09206 - 0.04514
Total volume of solution = [224.9 + 41.04] mL = 265.94 mL = 0.26594 L (Conversion factor: 1 L = 1000 mL)
To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:
We are given:
= negative logarithm of acid dissociation constant of propanoic acid = 4.89
pH = ?
Putting values in above equation, we get:
Hence, the pH of acid solution is 4.58
Considering the definition of mole fraction, the mole fraction of O₂ in the mixture is 0.434.
<h3>Definition of mole fraction</h3>The molar fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution.
In other words, the mole fraction expresses the concentration of solute in a solution as the ratio of moles of substance to total moles of solution:
In this case, you know a gas mixture used for anesthesia contains 4.60 mol oxygen (O₂) and 6.00 mol nitrous oxide (N₂O).
So, the total moles of the solution can be calculated as:
Total moles = moles of oxygen (O₂) + moles of nitrous oxide (N₂O)
Then:
Total moles= 4.60 moles + 6 moles
Total moles= 10.60 moles
Finally, the more fraction of O₂ can be calculated as follow:
Solving:
<u><em>Mole fraction O₂ = 0.434</em></u>
Finally, the mole fraction of O₂ in the mixture is 0.434.
Learn more about mole fraction:
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