# Ideal Gas Law

If anyone has time, could you please show me the working of this problem.

Greatly appreciated

b]1. Homework Statement [/b]
If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87C, how many moles of gas do I have?

PV=nRT=NkT

## The Attempt at a Solution

1.2 x 31=n8.3145 x (87+273)= N x 1.38066x10*23 x (87+273)

Can you tell me if the above numbers are correct please.

## Answers and Replies

Andrew Mason
Science Advisor
Homework Helper
If anyone has time, could you please show me the working of this problem.

Greatly appreciated

b]1. Homework Statement [/b]
If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87C, how many moles of gas do I have?

PV=nRT=NkT

## The Attempt at a Solution

1.2 x 31=n8.3145 x (87+273)= N x 1.38066x10*23 x (87+273)

Can you tell me if the above numbers are correct please.
You have to stick to MKS units. Volume has to be in m^3 not litres. Otherwise, it looks fine.

AM

The pressure should be in pascals as well.

Andrew Mason
Science Advisor
Homework Helper
The pressure should be in pascals as well.

Of course! Thanks for catching that.

AM

Redbelly98
Staff Emeritus
Science Advisor
Homework Helper
... how many moles of gas do I have?

## Homework Equations

PV=nRT=NkT

Given what is being asked, would you use nRT or NkT here?

Given what is being asked, would you use nRT or NkT here?

nRT ??

Redbelly98
Staff Emeritus
Science Advisor
Homework Helper
Why do you think that ... or is it just a random guess? The key here is: what do n and N mean?

Why do you think that ... or is it just a random guess? The key here is: what do n and N mean?

n - number of moles

N - number of molecules

Redbelly98
Staff Emeritus
Science Advisor
Homework Helper
Okay, yes. n is the number of moles, so PV=nRT is the thing to use here.

Just be careful with the units, as others said earlier.