ICE chart question

[kg21]

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This question is from TBR Gen Chem Section 3 Passage 4.
Can someone explain to me how they know the initial partial pressure of CS2 is 0.2?

In the explanation for question 25, they create an ICE (ISE in the book). The initial partial pressure of H2 (0.8) is given in the passage, and they write the initial partial pressure of CS2 as 0.2. I presume this is from 1 - 0.8, but I don't understand how they found that.

 

[sakabato93]

This question is from TBR Gen Chem Section 3 Passage 4.
Can someone explain to me how they know the initial partial pressure of CS2 is 0.2?

In the explanation for question 25, they create an ICE (ISE in the book). The initial partial pressure of H2 (0.8) is given in the passage, and they write the initial partial pressure of CS2 as 0.2. I presume this is from 1 - 0.8, but I don't understand how they found that.

I don't have the book, but I'll take a guess at this.

If the total pressure in the container is 1 atm, and there are only two gases in the container (H2 and CS2), then by Dalton's Law of Partial Pressures, CS2 must be pressure 0.2 atm if H2 is 0.8 atm. The sum of the partial pressures of all the gases in a container must equal the pressure of the container according to Dalton's Law.

Hope this helps!👍

 

[jjunior]

is it because its at standard temperature and pressure or something? in which case would be 1atm? double check tho 🙂

 

[kg21]

Here you go!