The volume of O₂ produced: 84.6 L
<h3>Further explanation</h3>
Given
7.93 mol of dinitrogen pentoxide
T = 48 + 273 = 321 K
P = 125 kPa = 1,23365 atm
Required
Volume of O₂
Solution
Decomposition reaction of dinitrogen pentoxide
2N₂O₅(g)→4NO₂(g)+O₂ (g)
From the equation, mol ratio N₂O₅ : O₂ = 2 : 1, so mol O₂ :
= 0.5 x mol N₂O₅
= 0.5 x 7.93
= 3.965 moles
The volume of O₂ :
The air surrounding the hot plate would heat up through the process of convection
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Limitations of word equation and formula equation is that they do not express the quantities of reactant and product in the reaction.
Explanation:
Word equation expresses the chemical reaction in words. The reactants products and the direction of the reaction is mentioned in it. The information is used to write a chemical reaction. The word "reacted' shows the reactants and 'forms' show product. The sequence of reactions, moles of reactant and product is written.
Limitations:
Rate of reaction cannot be known.
Actual amount of product formed cannot be known.
eg: Addition of sodium oxide with water produces sodium hydroxide.
In formula equation symbols for element representation are used. The ratio of the elements in the reaction are also there. The atom numbers are indicated by the subscript number.
Limitations:
Concentration of both reactants and products is not mentioned.
The physical conditions of the reactants are not told
The thermodynamic conditions are not expressed as rate of reaction, pressure and temperature requirement.
Time taken to complete the reaction cannot be known.
Reaction mechanism cannot be observed by only chemical equations.
Value of actual yield is not given.
Answer : The change in enthalpy for the reaction is, 175 kJ
Explanation :
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The main reaction is:
The intermediate balanced chemical reaction will be,
(1) 
(2) 
(3) 
Now we are dividing reaction 1 by 2, dividing reverse reaction 2 by 2 and then adding all the equations, we get :
(1) 
(2) 
(3)
The expression for change in enthalpy of the given reaction is:
Therefore, the change in enthalpy for the reaction is, 175 kJ
