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I/GCSE Chemistry- Calculations with Moles (1/2)

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· igcse chemistry

In this I/GCSE Chemistry blog post, we will be looking at the formulas used to calculate the chemical equation of moles.

Relative Molecular Mass  

NOTE: The same method is used to find relative molecular mass and relative formula mass

To find the relative molecular mass of a substance, add together the atomic masses of all the atoms in the molecule.

E.g.

CH4 contains 1 carbon atom and 4 hydrogen atoms.

The relative atomic mass of carbon is 12 and of hydrogen is 1

The relative molecular mass is therefore 12 + 1 + 1 + 1 + 1 = 16 

Number of Moles in a Substance  

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To find the number of moles in a substance:

Number of moles = mass(g) / mass of 1 mole

E.g. Find the number of moles in 2g of H2O

1. find the mass of 1 mole: 1 + 1 + 16 = 18g

2. divide the mass you have (2g) by the mass of one mole (18g): 2/18 = 0.1111

so there are 0.1111 moles of H20 in 2g

Percentage Yield 

To calculate the percentage yield from an experiment:

% yield = actual yield / theoretical yield * 100 

That is all!

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References:

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.ncl.ac.uk%2Fwebtemplate%2Fask-assets%2Fexternal%2Fmaths-resources%2Fmolar-calculations.html&psig=AOvVaw0Q_4N_l51i8AOlDUTUxize&ust=1628001185618000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCPCPk5XHkvICFQAAAAAdAAAAABAD

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