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C2.3 (Calculating reacting masses (higher) (In all chemical reactions, the…
C2.3
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Atomic structure
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---------------Proton--------Neutron---------Electron
Charge-------+1---------------0--------------------1
Mass-----------1----------------1-------------almost zero
percentage yield
In most reaction you will not get the same mass of products as your reactants.
This can be because:
Some is lost tot eh air
Some is not taken out the reaction chamber
Companies need to know their percentage yield so they can see how effective their reaction is and if its going wrong (Shown when the percentage yield is a lot lower than normal)
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Relative atomic mass
the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon-12.
Write the formula of the compound.
Write the numbers of each atom in the formula.
Insert the relative atomic mass for each type of atom.
Calculate the total mass for each element.
Add up the total mass for the compound.
Relative formula mass
The relative formula mass of a substance, shown in grams, is called one mole of that substance. So one mole of carbon monoxide has a mass of 28g, and one mole of sodium oxide has a mass of 62g.
sodium oxide (Na2O).
The Ar of sodium is 23 and the Ar of oxygen is 16.
So the Mr of sodium oxide is (23 x 2) + 16 = 62.
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