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chemical formulae, equations and calculations - Coggle Diagram
chemical formulae, equations and calculations
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the mole
Chemical amounts are measured in moles (therefore it is the amount of substance). The symbol for the unit mole is mol.
The mass of one mole of a substance in grams is numerically equal to its relative formula mass.
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(Mr) from relative atomic masses (Ar)
For example, the Ar of Iron is 56, so one mole of iron weighs 56g.
The Mr of nitrogen gas (N2) is 28 (2x14), so one mole is 28g.
One mole of a substance contains the same number of the stated particles, atoms, molecules or ions as one mole of any other substance
reacting masses
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Masses of reactants & products can be calculated from balanced symbol
equations. If you are given the reacting mass of one reactant and asked to find the mass of one product formed:
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equations
(g) means gas, (s) means solid, (l) means liquid, (aq) means aqueous
Example of word equation: hydrochloric acid + sodium hydroxide -> sodium chloride + water
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to balance an equation: you need to make sure there are the same number of
each element on each side of the equation and if there isn’t use big numbers at the front of a compound to balance it e.g. 3H2 O
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Percentage yield = (Amount of product produced x 100)/ Maximum amount of product possible
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relative formula mass
Relative formula mass (Mr) of a compound: sum of the relative atomic masses of the atoms in the numbers shown in the formula
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