When the products of a reaction are hotter than the reactants: The reaction is exothermic. The reaction is endothermic. The reac
2 answers:
Answer: Option (a) is the correct answer.
Explanation:
A chemical reaction in which energy is released is known as an exothermic reaction.
For example,
In an exothermic reaction, energy of products is less than the energy of reactants. As heat is released that is why, formation of products become hotter.
On the other hand, a chemical reaction in which energy is absorbed by reactant molecules is known as an endothermic reaction.
For example,
In an endothermic reaction, energy of products is more than the energy of reactants. As heat is absorbed, so formation of products become colder.
Thus, we can conclude that when the products of a reaction are hotter than the reactants the reaction is exothermic.
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Taking into account the definition of molarity, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 .
Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
Molarity is expressed in units .
In this case, you have:
- number of moles= 0.2 moles
- volume= 100 mL= 0.1 L
Replacing in the definition of molarity:
Solving:
<u><em>molarity= 2 </em></u>
Finally, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 .
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