In writing the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of KOH and Mg(NO3)2 are mixe
1 answer:
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Answer:
2Li + F₂ → 2LiF
Explanation:
The reaction expression is given as:
Li + F₂ → LiF
We are to balance the expression. In that case, the number of atoms on both sides of the expression must be the same.
Let use a mathematical approach to solve this problem;
Assign variables a,b and c as the coefficients that will balance the expression:
aLi + bF₂ → cLiF
Conserving Li: a = c
F: 2b = c
let a = 1, c = 1 and b =
Multiply through by 2;
a = 2, b = 1 and c = 2
2Li + F₂ → 2LiF
Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.
<h3>Enthalpy of a chemical reaction</h3>The enthalpy of a chemical reaction is known as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
<h3>Heat released in this case</h3>In this case, the balanced reaction is:
2 Mg(s) + O₂ (g) → 2 MgO(s) + 1204 kJ
This equation indicates that when 2 moles of Mg reacts with 1 mole of O₂, 1204 kJ of heat is released.
When 0.75 moles of Mg are burned, then you can apply the following rule of three: if 2 moles of Mg releases 1204 kJ of heat, 0.75 moles of Mg releases how much heat?
<u><em>heat= 451.5 kJ</em></u>
Finally, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.
Learn more about enthalpy of a chemical reaction:
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