1,How many grams of potassium chlorate must be decomposed to produce 288g of oxygen?(k=39 ,Cl=35.5 O=16)
KClO3-----> KCl + 3O2
2,How many grams of oxygen can be prepared by the decomposition of 12g of mercury(ll) oxide? (atomic masses; Hg=200 O=16)
2HgO-------> 2Hg + O2
3,what mass of aluminium would be completely oxidized by 44.8L of oxygen to produce Al2O3 at STP?

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