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Moles - Coggle Diagram
Moles
Mole
moles = mass of element or compound (g) / molar mass of element or compound (g)
the mole is a measure of the amount of substance
triangle
the mass of one mole of substance calculated as follows
-for elements = Ar expressed in g
-for compounds = formula mass expressed in g
Molar Mass
The mass per mole of a substance.
The units of molar mass is g mol^-1
Mr
Avogadro's constant
The number of atoms per mole of the carbon-12 isotope
6.02x10^23 mol^-1
Calculating the Mass of a substance
Mass of 0.05 moles of Sodium Thiosulfate
Mr=248.20
H=10 (1.01)=10.1
S=2 (32.06)=64.12
Mass= 1.2x10^1 g (2sf)
Na=1(22.99)=32.06
Mass= Moles x Molar Mass
Mass= 0.05 x 248.20
O=8 (16.00)=128.00
Calculating the number of moles in a substance
Number of moles in 560g of ethene
Mr=28.06
H=4(1.01)=4.04
Moles= 2.00x10^1 mol (3sf)
Moles=560/28.06
Moles=Mass/Molar Mass
C=2(12.01)=24.02