Answer:
In none of the reactions ΔH°rxn equal to ΔH°f of the product.
Explanation:
The standard enthalpy of formation (ΔH°f) is the enthalpy change when 1 mole of a product is formed from its constituent elements in the standard states.
1/2 O₂(g) + H₂O(g) ⟶ H₂O₂(g)
ΔH°rxn is NOT equal to ΔH°f of the product because H₂O(g) is not an element but a compound.
Na⁺(g) + F⁻(g) ⟶ NaF(s)
ΔH°rxn is NOT equal to ΔH°f of the product because Na and F are not in their standard states (Na(s); F₂(g)).
K(g) + 1/2 Cl₂(g) ⟶ KCl(s)
ΔH°rxn is NOT equal to ΔH°f of the product because K is not in its standard state (K(s)).
O₂(g) + 2 N₂(g) ⟶ 2 N₂O(g)
ΔH°rxn is NOT equal to ΔH°f of the product because 2 moles of N₂O are formed.
In none of the above ΔHrxn equal to ΔHf of the product.
Answer is: The breakdown of ozone is an endothermic process.
There
are two types of reaction: endothermic reaction (chemical reaction that
absorbs more energy than it releases) and exothermic reaction (chemical
reaction that releases more energy than it absorbs).
Ozone has lower energy than molecular oxygen (O₂) and oxygen atom, so ozone need energy to break bond between ohygen atoms.
Explanation:
Number of Cm neutrons = 242 - 96 = 146
The
balanced reaction would be written as:
<span>
C7H6O3 + C4H6O3--->C9H8O4 + HC2H3O2
To determine the percent yield, we need to first
determine the theoretical yield if the reaction were to proceed completely.
Then, we divide the actual yield that is given to the theoretical yield times
100 percent. The limiting reactant from the reaction would be salicylic acid.
We do as follows:
<span>Theoretical yield: 50.05 g C7H6O3 ( 1 mol /
138.21 g ) ( 1 mol C9H8O4 / 1 mol C7H6O3 ) ( 180.157 g / mol ) = 65.24 g C9H8O4 should be produced
Percent yield = 55.45 / 65.24 x 100 = 84.99%
<span>
Therefore, the percent yield for the given amount of salicylic acid is 84.99%
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