Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
Topic 1
Member rating: No Rating | Words: | Submitted: Tue Oct 17 2006
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
Unit 1.2: Formulae, equations and moles Learning bit:- Avogadros constant is the number of carbon atoms in exactly 12g of the carbon-12 isotope. It is equal to 6.02x 10^23 mol^-1. One mole of a substance is the amount of that substance that contains 6.02x 10^23 particles of that substance. This means that one mole of a substance is its relative atomic or molecular mass expressed in grams. The molar mass of a substance is the mass (in grams) of one mole. Amount of substance is the number of moles of that substance. The empirical formula is the simplest whole number ratio of the elements in the compound. Calculation of empirical formulae from percentage data Easy way of calculating it: - Element % of element %/Ar Divide by lowest Carbon 48.7 48.7/12 = 4.1 4.1/2.7=1.5 Hydrogen 8.1 8.1/1 = 8.1 8.1 / 2.7 = 3 Oxygen 43.2 43.2 / 16 = 2.7 2.7 / 2.7 = 1 The last column gives the empirical formula, but if any value in this column comes to a non-integer value,...
Get instant access
- Instant, unlimited access to our documents in full
- Swap your work for free access, or pay £4.99
- To see the full version of this document and 146,209 others
Receive email updates for this category
- Simply tell us your email address and receive a weekly Study Help Email for FREE
- Receive 3 FREE essay views with each email
- Get all the latest essays from Coursework.Info & discussion from TheStudentRoom.co.uk
