MYTUTOR SUBJECT ANSWERS

879 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...

2 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

99 SUBJECT SPECIALISTS

£22 /hr

Xanthe W.

Degree: Biological Sciences with a Year in Industry/Research (Bachelors) - Imperial College London University

Subjects offered:Chemistry, Maths+ 1 more

Chemistry
Maths
Biology

“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

£20 /hr

George N.

Degree: Chemistry (Masters) - York University

Subjects offered:Chemistry, Physics

Chemistry
Physics

“20 year old second year chemistry student at the University of York. Drummer, guitarist, rugby player and radio host who has experience and a love for tutoring.”

£20 /hr

Abhinav T.

Degree: Medicine (Other) - University College London University

Subjects offered:Chemistry, Physics+ 2 more

Chemistry
Physics
Maths
Biology

“Confirming understanding by verbal confirmation and communication so as to ensure clarity and confidence during the learning process and progression.”

MyTutor guarantee

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

What is Le Chatelier's principle?

State whether the following conduct electricity as solid or molten: Aluminium, Aluminium fluoride, Boron tribromide

What is enthalpy?

What is the difference between benzene and cyclohexene?

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