Answer:
3.25 × 10²⁴ molecules of water
Explanation:
Step 1: Write the balanced equation
3 PbO + 2 NH₃ → 3 Pb + N₂ + 3 H₂O
Step 2: Calculate the moles of water formed from 3.60 moles of ammonia
The molar ratio of NH₃ to H₂O is 2:3. The moles of water formed are 3/2 × 3.60 mol = 5.40 mol
Step 3: Calculate the molecules in 5.40 moles of water
We will use Avogadro's number: 6.022 × 10²³ molecules/mol.
5.40 mol × 6.022 × 10²³ molecules/mol = 3.25 × 10²⁴ molecules
pH of buffer solution : 4.32
<h3>Further explanation
</h3>
A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solutions consist of weak acids(H₂CO₃) and their salts.(NaHCO₃)
mol H₂CO₃

mol NaHCO₃

![\tt [H^+]=Ka\dfrac{mole~weak~acid}{mole~salt}\\\\(H^+]=1.8\times 10^{-5}\dfrac{0.008}{0.003}=4.8\times 10^{-5}\\\\pH=5-log~4.8=4.32](https://tex.z-dn.net/?f=%5Ctt%20%5BH%5E%2B%5D%3DKa%5Cdfrac%7Bmole~weak~acid%7D%7Bmole~salt%7D%5C%5C%5C%5C%28H%5E%2B%5D%3D1.8%5Ctimes%2010%5E%7B-5%7D%5Cdfrac%7B0.008%7D%7B0.003%7D%3D4.8%5Ctimes%2010%5E%7B-5%7D%5C%5C%5C%5CpH%3D5-log~4.8%3D4.32)
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