1. Explain why in a reaction involving two reactants, one reactant is said to be

Question

1. Explain why in a reaction involving two reactants, one reactant is said to be limiting and the other reactant is to be in excess. 2. Write a balanced chemical equation for the single-displacement reaction between magnesium metal and hydrochloric acid. Copy your equation to the Procedure under Activity 1 and the Data Sheet part 1. 3. A reaction of magnesium metal with hydrochloric acid requires 0.284 moles of hydrochloric acid. Calculate the volume of 0.8624 M hydrochloric acid that is needed for the reaction How many A reaction of magnesium metal with hydrochloric acid produces 0.126 moles of hydrogen gas. moles of magnesium metal are required? How many grams of magnesium metal are required? 4. 5. Based on the reaction illustrated in the introduction, answer the following questions. Explain what would happen if two more molecules of B2 were added to the products shown in Figure 2? Explain which reactant(s) are excess and which are limiting a. Explain what would happen if, instead of adding molecules of B2 to the products shown in Figure 2, two more B2 molecules were added to the reactants? Explain which reactant(s) are excess and which are limiting. b.

Explanation / Answer

In a reaction, depending on the reactivity of the reagent one reagent has to taken in excess with respect to another reagent. Herein, the less reactive reagent generally taken in excess. Now, when the more reactive reagent totally reacted, then the less reactive reagent remains excess in the reaction mixture, because there is no other reagent present to react with it. In this case the more reactive reagent that has been taken in less quantity, are termed as limiting reagent. And consequently, the other termed as excess reagent.In a reaction, depending on the reactivity of the reagent one reagent has to taken in excess with respect to another reagent. Herein, the less reactive reagent generally taken in excess. Now, when the more reactive reagent totally reacted, then the less reactive reagent remains excess in the reaction mixture, because there is no other reagent present to react with it. In this case the more reactive reagent that has been taken in less quantity, are termed as limiting reagent. And consequently, the other termed as excess reagent.

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