What is the percent composition of hydrogen in a compound if the mass of the initial compound is 276 grams and the mass of colle
2 answers:
Answer : The percent composition of hydrogen in a compound is, 15%
Solution : Given,
The mass of compound = 276 grams
The mass of collected hydrogen after decomposition = 41.4 grams
Formula used :
Now put all the given values in this formula, we get the percent composition of hydrogen.
Therefore, the percent composition of hydrogen in a compound is, 15%
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<u>Answer:</u> The pH of the solution after addition of KOH is 3.84
<u>Explanation:</u>
We are given:
pH of buffer = 3.75
of formic acid = 3.75
Using Henderson-Hasselbalch equation for formate buffer:
Putting values in above equation, we get:
We are given:
Concentration of formate buffer = 0.100 M
As, the volume of buffer is the same. So, the concentration is taken as number of moles of formate ions as well as formic acid
To calculate the number of moles for given molarity, we use the equation:
Molarity of KOH = 1.00 M
Volume of solution = 5 mL
Putting values in above equation, we get:
The chemical reaction for formic acid and KOH follows the equation:
Initial: 0.05 0.005 0.05
Final: 0.045 - 0.055
Volume of solution = 500 + 5 = 505 mL = 0.505 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 formic acid = 3.75
pH = ?
Putting values in above equation, we get:
Hence, the pH of the solution after addition of KOH is 3.84