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Moles Revison
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Terms in this set (12)
What does Ar mean?
Relative atomic mass
What is the empirical formula?
The simplest whole number ratio of atoms of each element in a compound
How do you find the Mr
Add the Ar's of the atoms together
How do you calculate the empirical formula?
Simplify all the numbers in the chemical formula using their highest common factor.
What does Mr mean?
Formula/Molecular Mass
What is the equation for moles?
Moles = mass/Mr
How do you find the percentage of an element in a compound?
Use the formula (Ar x no. of atoms/ Mr of compound) x100
Avogadro's Number
6.02 x 10^23
Calculate the mass of 3.5 moles of carbon dioxide.
154g
Calculate the number of moles in 695g of silicon dioxide (SiO₂).
11.58
Calculate the mass of 0.8 moles of water.
14.4g
Calculate the number of moles in 39g of water.
2.17
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