# Mole Concept Q: Volume of 5.25g Nitrogen @ 26\circ C, 74.2 cm

• Chemistry
• Saitama
In summary, the conversation discusses a question related to the Mole Concept. The question asks to calculate the volume occupied by 5.25g of nitrogen at specific conditions. The conversation goes on to discuss the solution, using the ideal gas equation and considering the units of pressure. The conversation also mentions the potential of posting more questions on the topic, but advises against posting too many at once. The conversation ends with the participant expressing difficulty with the questions but being determined to solve them on their own.
Saitama

## Homework Statement

Hello Everyone!
I am solving a lots and lots of questions on Mole Concept but i am getting stuck in this:-

Calculate the volume occupied by 5.25g of nitrogen at 26$\circ$ C and 74.2 cm of pressure.

## The Attempt at a Solution

I actually don't know from where should i start. I have done questions when the conditions are at STP but i have never done a question like this.

Thanks!

start by the fact that one mole of any gas at 273K and 1 bar pressure occupies 22.7L volume

piyushkumar said:
start by the fact that one mole of any gas at 273K and 1 bar pressure occupies 22.7L volume

I thought of starting by this but i am not able to think of the next step.

This is direct application of ideal gas equation, PV=nRT. The only problem is with units of the pressure - is it cm (which doesn't make sense to me), or cm Hg?

Borek said:
This is direct application of ideal gas equation, PV=nRT. The only problem is with units of the pressure - is it cm (which doesn't make sense to me), or cm Hg?

So what should be the unit?

cm Hg most likely. Close relative of mmHg, or torr.

Borek said:
cm Hg most likely. Close relative of mmHg, or torr.

I am having many questions to solve in mole concept (almost a full book). If i get any doubts, can i post them in this thread one by one?

In general you should start a new thread with each one. But there is a catch - if you start several at once, that's wrong as well.

Let's hope you will be able to deal with most of the questions on your own

Borek said:
In general you should start a new thread with each one. But there is a catch - if you start several at once, that's wrong as well.

Let's hope you will be able to deal with most of the questions on your own

Yes i will try to solve them by my own
But they are really tough...

## 1. What is the equation for calculating volume using the mole concept?

The equation for calculating volume using the mole concept is V = nRT/P, where V is volume, n is the number of moles, R is the gas constant, T is the temperature, and P is the pressure.

## 2. How do you convert grams to moles?

To convert grams to moles, you divide the mass of the substance by its molar mass. The molar mass can be found by adding up the atomic masses of each element in the substance.

## 3. What is the molar mass of nitrogen?

The molar mass of nitrogen is 14.01 g/mol.

## 4. How do you convert Celsius to Kelvin?

To convert Celsius to Kelvin, you add 273.15 to the Celsius temperature. In this case, the temperature given is 26°C, so to convert to Kelvin, you add 273.15, resulting in 299.15 K.

## 5. What is the value of the gas constant (R)?

The value of the gas constant (R) depends on the units used in the equation. In this case, since the units for volume are given in cm, the value of R would be 0.0821 L*atm/mol*K.

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