MYTUTOR SUBJECT ANSWERS

594 views

What is a mole?

In chemistry the mole (mol) is a basic unit to describe a quantity of substance based on the number of particles (atoms or molecules) that it contains.

The number of particles in one mole of substance is 6.022x10^23, also known as the Avogadro constant.

Often when we set up chemical reactions we use relatively large masses of reactants, e.g. from few grams to kilograms. Even a gram contains billions and billions of particles, and it would be impractical to use such large numbers.

Because 1 mole = 6.022x10^23 particles, the mole acts as an easy way of referring to very large numbers of particles. The Avogadro constant acts as a reference large number.

Why is the Avogadro constant 6.022x10^23?

This is the number of atoms in 12 g of Carbon-12 (the relative atomic mass of the carbon atoms).

Tomos P. A Level Chemistry tutor, GCSE Physics tutor, GCSE Maths tuto...

2 years ago

Answered by Tomos, who tutored A Level Chemistry with MyTutor


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

96 SUBJECT SPECIALISTS

£26 /hr

Martyna S.

Degree: Neurotechnology (Masters) - Imperial College London University

Subjects offered:Chemistry, Science+ 4 more

Chemistry
Science
Maths
Biology
.BMAT (BioMedical Admissions)
-Personal Statements-

“PhD candidate in Bioengineering at Imperial College London. Long experience in effective tutoring!”

£24 /hr

Eilidh F.

Degree: Natural Sciences (Bachelors) - York University

Subjects offered:Chemistry, Maths+ 2 more

Chemistry
Maths
Further Mathematics
Biology

“About me: My name is Eilidh (pronounced Aylee) and I am a student at the University of York. I study Natural Sciences specialising in Neuroscience, and have always loved both Science and Maths. I also reallyenjoy teaching, meeting new...”

£24 /hr

Thomas D.

Degree: Neuroscience (Bachelors) - Kings, London University

Subjects offered:Chemistry, Science+ 3 more

Chemistry
Science
Physics
Maths
Biology

“I am currently in my second year of a Neuroscience Bachellors' degree at a Russel Group institution, that is King's College London. Having done five (yes 5) A2s, and achieved an A* and 5 As, I know a few tricks of the trade so to spea...”

About the author

£24 /hr

Tomos P.

Degree: Developmental Neuroscience (Masters) - Cambridge University

Subjects offered:Chemistry, Science+ 3 more

Chemistry
Science
Physics
Maths
Biology

“Hi, my name Tom and I am a postgraduate student at Cambridge University. I currently study developmental neuroscience and tutor Chemistry, Biology, Physics and Maths.”

You may also like...

Other A Level Chemistry questions

What is a dynamic equilibrium?

How can I improve my exam technique?

What is the difference in kinetics between a 0th, 1st and 2nd order reaction?

What is the trend in atomic radius of the elements across Period 3 and why does this occur?

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