Amount of substance

Powerpoint displaying the 'need to know' equations and definitions for unit1: chapter 2 - amount of substance in the AQA textbook.

Includes: Mr; Ar; Avogadro constant; ideal gas equation; empirical formula; molecular formula; moles in solution; percentage yield; atom economy.

Displays all the information in short, easy to read chunks. Equations you must learn are in pink.

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Relative Atomic Mass
THE AVERAGE MASS OF AN ATOM OF AN
ELEMENT RELATIVE TO 1/12th THE MASS OF
AN ATOM OF CARBON-12.
Ar
Ar = AVERAGE MASS OF AN ATOM OF AN ELEMENT
1/12th THE MASS OF AN ATOM OF CARBON 12…read more

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Relative Molecular Mass
THE AVERAGE MASS OF A MOLECULE RELATIVE TO
1/12th THE MASS OF AN ATOM OF CARBON-12.
Mr
Mr = AVERAGE MASS OF A MOLECULE OF A COMPOUND
1/12th THE MASS OF AN ATOM OF CARBON 12
NOTE: You can calculate the Mr of a compound by adding the Ar
of the atoms in the molecule together.
EG. Calculate the Mr of Na2SO4
Mr = Na x 2 = 23.0 x 2 = 46.0
S x 1 = 32.0 x 1 = 32.0
O x 4 = 16.0 x 4 = 64.0
TOTAL Mr = 142.0…read more

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The Avogadro constant and the
mole
THE AVOGADRO CONSTANT IS THE NUMBER OF ATOMS
PRESENT IN 12g OF CARBON-12.
The Avogadro number is:
6.022 x10²³
of moles = MASS
Mr…read more

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The ideal gas equation
PV = nRT
P = Pressure in Nm²
V = Volume in m³
n = Number of moles
R = Constant (8.31 Jmol¹K¹)
T = Temperature in K
NOTE: 0ºC = 273K, 1ºC = 274K, etc.
NOTE: 1 Pa = 1 Nm²
1 kPa = 1 Nm² x10³ (or 1000 Nm²)…read more

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The empirical formula
THE EMPIRICAL FORMULA REPRESENTS THE SIMPLEST
RATIO OF ATOMS IN A MOLECULE
Step 1: Calculate moles (Mass/Ar)
Step 2: Divide all figures by the smallest amount of moles (Moles/Smallest)
Step 3: Convert figures into a ratio. If decimals occur, ultiply ratio in order to get integers
(whole numbers)
Step 4: Determine empirical forumla
Worked example:
Compound X contains 50.2g of sulfur and 50.0g of oxygen. Calculate empirical formula.
Element S O
Step 1: 50.2 = 1.564 50.0 = 3.125
32.1 16.0
Step 2: 1.564 = 1 3.125 = 2
1.564 1.564
Step 3: 1:2
Step 4: SO2…read more

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Comments

:) PurpleJaguar (: - Team GR

really helpful thanks a lot :)

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