3. Jasmine pousse un objet sur une distance de 15 m à une vitesse constante. Elle produit un
travail de 450 J sur l'objet. Quelle force Jasmine
exerce-t-elle sur l'objet?

Jasmine pushes an object a distance of  15 m at constant speed. It produces a  450J of work on the object. What strength Jasmine  does it exert on the object?

30J

Explanation:

Given parameters:

Distance moved  = 15m

Work done  = 450J

Unknown:

Strength Jasmine applied  = ?

Solution:

The strength Jasmine applied or exerted on the object is the force of pull that cause the motion of the object and the distance it was moved.

Now;

  Work done  = Force x distance

So;

       450  = Force x 15

          Force  =   = 30J

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.