2KClO3 2KCl + 3O2 2 - A. How many moles of oxygen gas would react with 250g of KCl?

2 - B. If 0.8 moles of KClO3 were used, how many grams of O2 were produced?

2- C. How many moles of KCl react with 305g of O2?

There are multiple questions for the chemical equation, so I've just combined them all into one.

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answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).