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H2S is a Toxic Gas with Rotten Egg Like Smell
By BYJU'S Exam Prep
Updated on: September 25th, 2023
Henry’s law constant for Carbon Dioxide in water is equal to 1.67*10 raised to the power 8 Pa at 298K. But how can we prove this? First, let’s start by calculating the number of moles in water, and later, we will calculate the number of moles in the H2S gas. After this, we can apply Henry’s law to determine the Law Constant.
Answer:
Calculating Henry’s Constant
1 Kg of solvent contains:
1000/18 = 55.55 moles
Thus, the mole fraction of H2S gas in the solution equals:
X = Moles of H2S / Moles of H2S + Moles of water
0.195 / (0.195 + 55.56) = 0.0035
At STP, pressure (p) = 0.987 bar
Now, as per Henry’s law:
p= KHx
⇒ KH = p / x
= 0.0987 / 0.0035 bar
= 282 bar
Summary:
H2S is a Toxic Gas with Rotten Egg Like Smell
Henry’s law constant is equal to 282 bar when the STP pressure is 0.987 bar, and the solubility of the H2S gas in the water at the STP is 0.195 m. You can go through the article to understand the step-by-step process of calculating Henry’s law constant in detail.
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