MYTUTOR SUBJECT ANSWERS

513 views

Can you explain what stoichometry actually is and why the ratio is not the same as the number of moles?

Stoichiometry is just a way of relating two species that react, in a ratio.

EXAMPLE: 

1A + 2B -> 3C

Now usually this would be written as A + 2B -> 3C but I've written the 1 to exaggerate the point.

Now say you have 1 mole of A and 2 moles of B, in this case THE STOICHIOMETRY is equal to the moles.

But if you have say 0.5 moles of A, you cannot say you have 1 mole of A can you. The stoichiometry is then only useful in determining how much of something you produce or react. So if you were told that the reaction goes to completion, you can work out how many moles of B and C you have, (Useful in equilibria).

So the stoichiometry ratios are
1A:2B:3C 

So if you have 0.5 moles of A, you will react 2 x 0.5 = 1 mole of B and 3 x 0.5 = 1.5 moles of C will be produced.

Michael R. A Level Maths tutor, GCSE Maths tutor, A Level Chemistry t...

1 year ago

Answered by Michael, an A Level Chemistry tutor with MyTutor


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

98 SUBJECT SPECIALISTS

Sahil M. A Level Biology tutor, GCSE Biology tutor, A Level Chemistry...
£22 /hr

Sahil M.

Degree: Medicine (Bachelors) - Manchester University

Subjects offered:Chemistry, Spanish+ 3 more

Chemistry
Spanish
Maths
Biology
-Medical School Preparation-

“Hello! My name is Sahil and I am currently a medical student at the University of Manchester. I am really looking forward to tutoring you in Spanish, Chemistry, Biology or Maths as well as trying to help you during the difficult proce...”

Aisling R. A Level Maths tutor, A Level Chemistry tutor
£24 /hr

Aisling R.

Degree: Chemistry (Bachelors) - Bristol University

Subjects offered:Chemistry, Maths

Chemistry
Maths

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

£24 /hr

Nketia O.

Degree: Pharmacy (Masters) - Durham University

Subjects offered:Chemistry, Physics+ 1 more

Chemistry
Physics
Biology

“Hello! My name’s Nketia. I got an A* in A-Level Biology and an A in A-Level Chemistry. I’m a second-year Pharmacy student who is ready to teach others.”

About the author

£20 /hr

Michael R.

Degree: Chemical Engineering with industrial experience (Masters) - Manchester University

Subjects offered:Chemistry, Physics+ 2 more

Chemistry
Physics
Maths
Electronics

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

MyTutor guarantee

You may also like...

Other A Level Chemistry questions

What is a ligand?

Although carbon dioxide is a linear molecule it is still a greenhouse gas. Explain why that is.

How many peaks would you expect from a Hydrogen NMR of Ethane?

Explain why ethanoic acid and hydrochloric acid of the same concentrations would give different pH readings

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