1. Ammonia reacts with oxygen according to the equation 4NH3(g)+5O2(g)→4NO(g)+6H2O(g),ΔHrxn=−906 kJ Calculate the heat (in kJ) associated with the complete reaction of 155 g of NH3.
2.
What mass of butane in grams is necessary to produce 1.5×103 kJ of heat? What mass of CO2 is produced? Assume the reaction to be as follows:
C4H10(g)+132O2(g)→4CO2(g)+5H2O(g),ΔHrxn=−2658 kJ
The concept used to solve the given problem is the knowledge of balanced equation and stoichiometry.
Stoichiometry is the factor which ensures that the chemical equation is balanced or not. This can be used to determine energy associated to chemical species.
Stoichiometry is the relative quantities of reactant and products in chemical reactions which relates the total mass of reactant to the products.
(1)
The given reaction when ammonia reacts with oxygen is as follows:
From the balanced equation, it shows that 4 mol of reacts with of to give of and of with the complete reaction.
One mole of contains of gas. So, of contains of gas.
As the heat liberated for the or of gas is .
So, heat liberated for 1 will be as follows:
So, the heat liberated for of gas will be as follows:
(2.1)
The given reaction when butane reacts with oxygen is as follows:
From the given balanced equation, it shows thatof reacts with of to give of and of with the complete reaction.
One mole of contains of gas.
As the heat liberated for the or of gas is .
So, heat liberated for y mol is or .
So, y will be
Now, mass of butane is calculated by formula as follows:
Here M is molar mass of butane and y is number of moles of butane.
Substitute for y and for M.
(2.2)
One mol of butane gas forms of .
So, of butane will produce of . Here x is calculated as follows:
Now, mass of is calculated by formula as follows:
Here M is molar mass of butane and x is number of moles of butane.
Substitute for x and for M.
Ans: Part 1The heat associated with the complete reaction of of is .
Concepts and reason
The concept used to solve the given problem is the knowledge of balanced equation and stoichiometry.
Stoichiometry is the factor which ensures that the chemical equation is balanced or not. This can be used to determine energy associated to chemical species.
Fundamentals
Stoichiometry is the relative quantities of reactant and products in chemical reactions which relates the total mass of reactant to the products.
(1)
The given reaction when ammonia reacts with oxygen is as follows:
From the balanced equation, it shows that 4 mol of reacts with of to give of and of with the complete reaction.
One mole of contains of gas. So, of contains of gas.
As the heat liberated for the or of gas is .
So, heat liberated for 1 will be as follows:
So, the heat liberated for of gas will be as follows:
(2.1)
The given reaction when butane reacts with oxygen is as follows:
From the given balanced equation, it shows thatof reacts with of to give of and of with the complete reaction.
As the heat liberated for the or of gas is .
So, heat liberated for y mol is or .
So, y will be
Now, mass of butane is calculated by formula as follows:
Here M is molar mass of butane and y is number of moles of butane.
(2.2)
One mol of butane gas forms of .
So, of butane will produce of . Here x is calculated as follows:
Now, mass of is calculated by formula as follows:
Here M is molar mass of butane and x is number of moles of butane.
Ans: Part 1
1. Ammonia reacts with oxygen according to the equation 4NH3(g)+5O2(g)→4NO(g)+6H2O(g),ΔHrxn=−906 kJ Calculate the heat...
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Ammonia reacts with oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 ---> 4NO + 6H2O When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent? A) NO B) O2 C) H2O D) no reagent is limiting E) NH3 What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___C7H14 + ___ O2 ---> ___ CO2 + __ H2O A) none of these B) 10...
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