Chemistry Question -- Opening a valve between two containers....

The only relevant information is the initial state of the two containers and the gas laws. In summary, using the ideal gas law, the moles of H2 and O2 in their respective containers before the valve is opened can be calculated as 0.731 mol and 0.731 mol, respectively.
  • #1
Physicsnoob90
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Homework Statement


Two closes containers are connected by a valve, which initially separates the containers from each other. C
Container A has 8.00 L of H2 at 3.00 atm and temperature 400 k.
Container B has 6.00 L of O2 at 4.00 atm and temperature 400 k

The valve is opened, the gases mix, and they then react to form H2O. (temperature for both stay the same)
Find the moles of each gases before the valve is opened.

Homework Equations


Chemical formula: 2 H2 (g) + O2 (g) === 2 H2O (g)

The Attempt at a Solution


for H2: PV/ RT , (3.00 atm) (8.00 L) / (0.0821 (L atm/ mol k)) (400 k) = 0.731 mol H2

I also got the same moles for O2, but i feel like i did something wrong. Can anyone help me?
 
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  • #2
You did OK, the part about the reaction is irrelevant to the system before the valve was open.
 

FAQ: Chemistry Question -- Opening a valve between two containers....

1. What is the purpose of opening a valve between two containers in chemistry?

The purpose of opening a valve between two containers in chemistry is to allow the transfer of substances between the two containers. This can be done for various reasons such as mixing, separating, or reacting substances.

2. How does opening a valve between two containers affect the pressure and volume of the substances?

Opening a valve between two containers allows the substances to equalize in pressure and volume. This is because the substances will flow from the container with higher pressure or volume to the container with lower pressure or volume until they reach equilibrium.

3. Are there any safety precautions to consider when opening a valve between two containers in chemistry?

Yes, there are several safety precautions to consider when opening a valve between two containers in chemistry. It is important to ensure that the substances being transferred are compatible and will not react explosively. It is also important to properly label and handle the containers to prevent spills and contamination.

4. How can the rate of flow be controlled when opening a valve between two containers?

The rate of flow between two containers can be controlled by adjusting the size of the valve opening. A larger opening will allow for a faster flow, while a smaller opening will slow down the flow. Additionally, the pressure difference between the two containers can also affect the rate of flow.

5. What are some common uses of opening a valve between two containers in chemistry?

Opening a valve between two containers is commonly used in chemical experiments and processes such as distillation, filtration, and chromatography. It is also used in industrial settings for transferring and mixing chemicals in large quantities.

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