HURRY ! Kumar is producing the photoelectric effect by using red light. He wants to increase the energy of emitted electrons. Ba
1 answer:
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Answer:
a)
b)
Explanation:
a) The reaction:
The free-energy expression:
The element wich is reduced is the Fe and the one that oxidates is the Mg:
The electrons transfered (n) in this reaction are 2, so:
b) If you have values of enthalpy and enthropy you can calculate the free-energy by:
with T in Kelvin
The volume of H₂O = 5 L
<h3>Further explanation</h3>Given
5L of H₂ and 3L O₂
Reaction
2H₂ (g) + O₂(g) ⇒2H₂O(g)
Required
The volume of H₂O
Solution
Avogadro's hypothesis:
<em>In the same T,P and V, the gas contains the same number of molecules </em>
So the ratio of gas volume will be equal to the ratio of gas moles
mol H₂ = 5, mol O₂ = 3
- Find limiting reactants
From equation, mol ratio H₂ : O₂ = 2 : 1, so :
- Find volume H₂O
mol H₂O based on mol H₂, and from equation mol ratio H₂ : H₂O=2 : 2, so mol H₂O = 5 mol and the volume also 5 L