According to the given balanced chemical equation, mole ratios that should be used to calculate moles of oxygen needed to react completely with a given number of moles of aluminum metal and to calculate moles of product expected if a given number of moles of aluminum metal reacts completely should be indicated.
Balanced chemical equation shows us identities of reactants and products and how much reactants and products participate in the reaction. The coefficients in the balanced equation enable us to calculate how much product we can get from a given quantity of reactant or to get a definite amount of product, how much reactants we need. The ratio of these coefficients is the useful one, not the individual coefficient. This ratio is known as Mole ratio. We need to obtain the correct mole ratio that cancel the chemical formula that we doesn’t need in the final answer and keep the formula.
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