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Write out the masses
Work out the moles
Divide by the smallest number
Show whole number ratio

What is the empirical formula of a compound containing 60.0% sulfur and 40.0% oxygen by mass?

60g 40g
33 16

1.81 2.5

56g of iron combined with 240g of bromine. What is the…

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BR

160/8
0

2




Ca

40/40

1




CAbr2




In an experiment, excess chlorine was passed over 27g of heated aluminium metal until all
the metal had reacted. If 133.5g of white aluminium chloride was formed work out the
formula of aluminium chloride. (Relative atomic masses:Al = 27 and Cl =…

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FeS2

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