Summary
Summary Unit 3.1.2 - Amount of substance NOTES
A-level AQA Chemistry Calculations notes and methods New spec Applicable to most exam boards
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
Follow
Content preview
Topic 2: Amount of a substanceRelative atomic mass and relative molecular mass
Relative atomic mass - The mass of an atom compared to the mass of 1/12th
of a Carbon-12 atom
Relative molecular mass - The mass of a molecule compared to the mass of 1/12th
of a Carbon-12 atom
Relative formula mass - used for ionic compounds
The mole and the Avagadro constant
Avagadro constant - 6.022 x 10
Number of particles = moles x avagadro’s constant
Mr x moles = mass (Mr moles carries mass)
The concentration of a substance in solution, is measured in mol dm–3.
Moles = concentration (mol dm-3) x volume (dm3)
1 dm3 = 1000 cm3
The ideal gas equation
Gas constant = 8.31
Empirical and Molecular Formula
Empirical formula is the simplest whole number ratio of atoms of each element in a
compound.
Molecular formula is the actual number of atoms of each element in a compound
The molecular formula is always a whole number multiple of the empirical formula.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller anjubellam. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75323 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now