How to find how many moles of an element are in a compound?
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I think you use the formula n = m/Mr
where n is the number of moles, m is the mass and Mr is the molar mass.
Eg. How many moles in 50.0g of O2
m = 50.0g
Mr = 16*2 = 32
n = 50/32 = 1.5625 mol
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