## When to use equation

$PV=nRT$

JustinHorriat_4f
Posts: 111
Joined: Wed Sep 18, 2019 12:19 am

### When to use equation

Ik that you would use this equation to find a value such as moles when given temp pressure and volume. However, can you use this equation to get the moles of reactant then go to moles of product and then find the concentration of the product using the volume?

Sarah Zhari 1D
Posts: 103
Joined: Sat Sep 14, 2019 12:16 am

### Re: When to use equation

May I ask if the equation you're referring to is pV=nRT? If so, then you can use the equation to find concentration if you have the pressure and temperature. I don't think that you can use this equation to find the concentration/volume of both the reactants and the products, as the pressure or a certain value would have changed.

ramiro_romero
Posts: 90
Joined: Sat Sep 07, 2019 12:16 am

### Re: When to use equation

I do not think so, if its a single constant value for volume you would be able to find moles. However, I do not see how you could find initial and final concentrations of a reaction only from that information.

Justin Seok 2A
Posts: 104
Joined: Sat Aug 24, 2019 12:15 am

### Re: When to use equation

You would probably need to know either one of the initial or final mole values, and figure out what changes out of pressure, volume and temperature to figure out how your mole amount has changed.

Ryan Yee 1J
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

### Re: When to use equation

I would just use m1v1=m2v2 to find concentration changes with the given variables, but the ideal gas equation should just be used to solve for a missing variable given the others.

ramiro_romero
Posts: 90
Joined: Sat Sep 07, 2019 12:16 am

### Re: When to use equation

Probably not, usually you need to use an ice table to find moles or concentration of products given the moles or concentration of reactants. You can also sometimes just multiply it according to the ratio of their coefficients.

kevinolvera1j
Posts: 103
Joined: Fri Aug 02, 2019 12:15 am

### Re: When to use equation

If you need a value for an letter that is in the law, you can almost always use the law

Jose Robles 1D
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

### Re: When to use equation

If you're talking about PV = nRT I don't know how you would find out if the moles are from the initial or the final, but you will be able to use it to find the moles overall.

Alan Cornejo 1a
Posts: 98
Joined: Fri Aug 30, 2019 12:15 am

### Re: When to use equation

For the ideal gas law it shoudlnt be used for that intended purpose, but for the issue you propose it would be suggested to using the m1v1= m2v2 equation

Gurmukhi Bevli 4G
Posts: 49
Joined: Wed Nov 14, 2018 12:20 am

### Re: When to use equation

Assuming you are talking about the ideal gas law, in which case yes, you can use the equation to find a value like moles when given temperature, pressure, and volume. In regards to the second part of your question, I don't think you would be able to use the given equation to find initial and final concentrations without more information, I would probably use an ICE table, or the equation m1v1=m2v2 to solve for those quantities.