Let’s solve Question 1 first.
We’re told that in Box 2, the pressure is increased to be proportional to the number of gas particles — meaning if you double the particles, you double the pressure (if volume and temperature stay the same).
In Box 3, we start with 60 particles at 1 atm. Then we add 40 more → total = 100 particles.
Since pressure is directly proportional to number of particles (at constant V and T), we can set up a ratio:
Pressure ∝ Number of particles
So:
P₁ / N₁ = P₂ / N₂
Plug in what we know:
P₁ = 1 atm
N₁ = 60
N₂ = 100
P₂ = ?
So:
1 / 60 = P₂ / 100
Multiply both sides by 100:
P₂ = 100 / 60 = 5/3 ≈ 1.67 atm
✔ So the new pressure in Box 3 is
1.67 atm (or exactly 5/3 atm).
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Now let’s look at Question 2.
It says: “Suppose molecules of hydrogen and oxygen in the containers have been replaced with water vapor molecules, having no different size.”
Wait — this seems like it might be cut off or incomplete. The sentence ends abruptly: “having no different size.” That doesn’t make full sense as written.
But looking at the context — probably it meant to say something like: “...replaced with water vapor molecules, which are larger/smaller/different in some way” — but it says “no different size,” which implies they’re the same size.
Also, the question starts with “2.” but there’s no actual question asked after that sentence. It just stops.
Given that, and since the user only uploaded one page and the second question appears incomplete, I’ll assume the main solvable problem is Question 1.
If the student intended to ask about Question 2, they’d need to provide the full text. But based on what’s visible, only Question 1 has enough info to solve.
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Final Answer:
1.67 atm
Parent Tip: Review the logic above to help your child master the concept of chemistry unit 4 worksheet 2 answers.
