MYTUTOR SUBJECT ANSWERS

2306 views

What is the ideal gas equation?

The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas. 

The terms are:

p = pressure, in pascals (Pa).

V = volume, in m3.

n = number of moles.

R = the gas constant, 8.31 J K-1 mol-1 (you will be given this value).

T = temperature, in kelvin (K).

In an exam question, you will be normally be given 4 of the terms and asked to work out the 5th. The equation can be rearranged to work out each of the different terms. For example, to calculate the number of moles, n:

pV = nRT is rearranged to n = RT/pV.

The hardest part of the question is often using the correct SI units, as given above. Often you will have to convert a term from the incorrect to the correct units before using it in the equation. 

Pressure may be given in atmospheres or kPa, for which the conversions are:

1 atm = 101,325 Pa. 

100 kPa = 100,000 Pa,

Temperature may be given in degrees celsius. To convert this to kelvin, you simply add 273. 

Volume may be given in cm3 or dm3, for which the conversion to mis:

1 m3 = 1000 dm= 1,000,000 cm3

Once you have the terms in the correct SI units, you can simply plug them into your rearranged equation.

Jeremy C. A Level Chemistry tutor, GCSE Chemistry tutor, GCSE Biology...

3 years ago

Answered by Jeremy, an A Level Chemistry tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

132 SUBJECT SPECIALISTS

£22 /hr

Akhil P.

Degree: Medicine (Bachelors) - Imperial College London University

Subjects offered:Chemistry, Physics+ 6 more

Chemistry
Physics
Maths
Biology
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Medical School Preparation-

“First Year Medical student at Imperial College. Studies all 3 sciences and Maths at A-levels and did an EPQ(4 A*s and an A)”

£20 /hr

Aminah S.

Degree: Natural Sciences (Bachelors) - Durham University

Subjects offered:Chemistry, Physics+ 3 more

Chemistry
Physics
Maths
Japanese
Biology

“Chemistry and Physics student at Durham university, here to motivate and support you in developing a solid understanding of your subject. ”

£22 /hr

Lucy S.

Degree: Chemistry (Masters) - Durham University

Subjects offered:Chemistry, Maths

Chemistry
Maths

“Reading Chemistry at Durham University with expertise in Chemistry and Mathematics (A*A*) at GCSE/A-level”

About the author

Jeremy C.

Currently unavailable:

Degree: Chemistry (Masters) - Durham University

Subjects offered:Chemistry, Science+ 1 more

Chemistry
Science
Biology

“First year Chemist at Durham University available to tutor Chemistry and Biology.”

MyTutor guarantee

You may also like...

Other A Level Chemistry questions

How to formulate and balance a redox equation under acidic conditions

"Sulfur Dioxide can be represented as a sulfur atom with double bonds to each of two oxygen atoms, explain the shape of this molecule and predict the bond angle".

Why do ionic compounds like NaCl conduct electricity when dissolved but not when they’re solid, whereas metals conduct electricity when they’re solid?

What are Van Der Waals dispersion forces?

View A Level Chemistry tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok