Answer the following questions accurately using full sentences. Your responses m

Question

Answer the following questions accurately using full sentences. Your responses may be handwritten or typed (preferred) and attached to the pre-lab. State whether each of these statements about reactions involving two reactants is correct, and why it is correct or incorrect. In a reaction, both reactants can be limiting. In a reaction, both reactants can be in excess. In a reaction, one reactant can be limiting and one can be in excess. Write a balanced chemical equation for the single-displacement reaction between magnesium metal and hydrochloric acid. Copy your equation to the Procedure under Activity 2.1 and the Data Sheet part 2.1. 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. A reaction of magnesium metal with hydrochloric acid produces 0.126 moles of hydrogen gas. How many moles of magnesium metal are required? How many grams of magnesium metal are required? The balances in the lab can weigh a maximum of 220.000 g at once. If a beaker has a mass of 86.4329 g, what is the maximum volume of water that can be weighed in the beaker? You can make the balance automatically subtract the mass of an empty beaker by setting the beaker on the balance and pressing the "tare" button. What mass will be displayed on the balance after each of these steps? An empty beaker that has a mass of 132.4834 g is placed on the balance. You press the "tare" button. You add 78.5632 mL of water to the beaker. You remove the beaker from the balance.

Explanation / Answer

A) In a reaction, both reactants can be limiting. (correct)

suppose if we take 6 g H2 and 28 g N2 react with each then formed ammonia

in this case both are limiting reagents .

N2 + 3H2 ----------------> 2NH3

28g 6g 34g

B) In a reaction, both reactants can be in excess. ( incorrect)

in it not possible one reactant only excess or none

3 g H2 react with 28 g N2 then NH3 formed

N2 + 3H2 -------------> 2NH3

28g 6g 34g

28g 3g ?

so limiting reagent is H2 and excess reagent is N2

C) In a reaction, one reactant can be limiting and one can be in excess. (correct)

3 g H2 react with 28 g N2 then NH3 formed

N2 + 3H2 -------------> 2NH3

28g 6g 34g

28g 3g ?

so limiting reagent is H2 and excess reagent is N2

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