
(a)
Interpretation: The balanced equation for the reaction is to be written.
Concept Introduction: A chemical process in which electrons are moved between two reactants is referred to as a
(a)

Answer to Problem 65A
The balanced equation for the reaction is as follows:
H2+I2→2HI
Explanation of Solution
Hydrogen gas and iodine vapor react to give gaseous hydrogen iodide.
H2+I2→2HI
The above equation is the balanced equation for the reaction.
(b)
Interpretation: The limiting reagent in the reactant is to be identified.
Concept Introduction: A chemical process in which electrons are moved between two reactants is referred to as a redox reaction. The redox reactions include combination reactions, combustion reactions, decomposition reactions, and single-replacement reactions.
(b)

Answer to Problem 65A
Iodine vapor is the limiting reagent.
Explanation of Solution
The reactant that limits how much product can be produced by a reaction is known as the limiting reagent. Only until the limiting reagent is consumed does the reaction take place.
Hydrogen gas and iodine vapor react to give gaseous hydrogen iodide.
H2+I2→2HI
From the figure, it is clear that the number of molecules of hydrogen remains in excess after reacting with iodine. Hydrogen gas is the excess reactant.
Iodine vapor is the limiting reagent since the molecules are in the lesser molecule when compared with hydrogen gas.
(c)
Interpretation: The number of molecules of the reagent in the excess that remain at the completion of the reaction is to be calculated.
Concept Introduction: A chemical process in which electrons are moved between two reactants is referred to as a redox reaction. The redox reactions include combination reactions, combustion reactions, decomposition reactions, and single-replacement reactions.
(c)

Answer to Problem 65A
The number of molecules of the reagent is three molecules of hydrogen gas.
Explanation of Solution
Hydrogen gas and iodine vapor react to give gaseous hydrogen iodide.
H2+I2→2HI
Iodine vapor is the limiting reagent.
The reaction occurs only till all the iodine vapor reacts with hydrogen gas.
There is four iodine vapor that has reacted with four hydrogen gas. So, the remaining molecules of hydrogen gas are three molecules.
(d)
Interpretation: The number of molecules of the limiting reagent needed to be added to the atomic window so that all the reactants will react to form products is to be calculated.
Concept Introduction: A chemical process in which electrons are moved between two reactants is referred to as a redox reaction. The redox reactions include combination reactions, combustion reactions, decomposition reactions, and single-replacement reactions.
(d)

Answer to Problem 65A
Three molecules of the limiting reagent iodine vapor are needed.
Explanation of Solution
Hydrogen gas and iodine vapor react to give gaseous hydrogen iodide.
H2+I2→2HI
Iodine vapor is the limiting reagent.
The reaction occurs only till all the iodine vapor reacts with hydrogen gas.
There is four iodine vapor that has reacted with four hydrogen gas. So, the remaining molecules of hydrogen gas are three molecules.
There is a need for three molecules of iodine vapor to react with excess hydrogen gas.
Chapter 12 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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