How many moles of oxygen are produced if 15 grams of iron (iii) oxide decomposes completely

 Stoichiometry is a big word for a process that chemist’s use to calculate amounts in reactions. It makes use of the coefficient ratio set up by balanced reaction equations to make connections between the reactants and products in reactions.

 Stoichiometry calculates the quantities of reactants and products in a chemical reaction. The equation must be balanced!

 Questions that deal with amounts in reactions are examples of reaction stoichiometry. We already have the tools necessary to solve this question. We just need to learn a new way to apply skills such as writing chemical formulas, calculating formula masses, and converting from mass to moles, particles to moles, and volume of gases to moles.

 Mole to Mole Conversions- you must have the Mole Ratio.

Explanation:

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a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.