# Moles1 The Basics Revision

Revision notes on Moles for AS chemistry.

- Created by: Anonymous
- Created on: 02-11-07 12:01

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Moles 1 The Basics Revision Page

Definitions:

Mole: a very large number 6.02 *1023 (Avogadro's Constant). It is a measurement eg a dozen.

Relative Atomic Mass (RAM): the weighted average mass of the atoms of an element in

their natural isotopic abundance, compared to carbon 12.

Relative Molar Mass (RMM): in grams of any molecule contains the same number of

molecules as there are atoms of carbon in12g of carbon 12.

Empirical Formula: the simplest whole number ratio of atoms of each element in a compound.

Molecular Formula: simple multiple of the empirical formula. It gives the correct molar mass.

Compound Working RMM

H2 SO4 (1*2) + 32 + (16*4) 98g/mol

How many atoms in Yg of X? RMMg of

X contains 6.02 *1023 atoms

1g of X contains 6.02 *1023 / RMM atoms

Yg of X contains (6.02 *1023 / RMM) *Y atoms

How many molecules in Yg of X?

RMMg of X contains 6.02 *1023 molecules

1g of X contains 6.02 *1023 / RMM molecules

Yg of X contains (6.02 *1023 / RMM) *Y molecules

How many atoms in 2 moles of X? 6.02 *1023 * 2

How many molecules on 0.5 moles of X? 6.02 *1023 / 2

Empirical Formula: (MMR 128

X Y

Mass

RMM

Moles

/Smallest

Ratio : eg.

C5H4

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