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### Calculating for Pressure

Posted: Sun Jan 12, 2020 9:12 pm
When trying to calculate the pressure of a substance, is it possible to do so without being given temperature?

### Re: Calculating for Pressure

Posted: Sun Jan 12, 2020 9:14 pm
Usually, temperature should be given so you can use PV=nRT to solve for pressure.

### Re: Calculating for Pressure

Posted: Sun Jan 12, 2020 9:27 pm
using PV=nRT for these types of problems, you usually assume the number of moles (n) remains the same, R is a constant, and in these questions you usually have a closed system with a constant volume. if you don't have T, you'd be solving for more than one unknown, which is impossible. so most likely no.

### Re: Calculating for Pressure

Posted: Sun Jan 12, 2020 9:34 pm
Temperature is needed in order to use the ideal gas law (solving for pressure in your case). You can't solve for two unknowns, so short answer is no, not possible.

### Re: Calculating for Pressure

Posted: Mon Jan 13, 2020 4:54 pm
In the scope of this class, when asked to calculate the pressure of a substance, you will be given a temperature and a relative concentration of this substance and will be expected to know how to manipulate the Ideal Gas LAw equation in order to solve the relation between concentration and pressure of a substance.

### Re: Calculating for Pressure

Posted: Mon Jan 13, 2020 5:04 pm
if you are dealing with all pressures though then yes it is!! Like if you use K subP then you can find the partial pressure even without temperature because no concentrations are involved so no equation with concentration or temperature is needed! just solve in the same way you do with K subC