Respuesta :
U = q+w
According to this, internal energy is the result of adding work and heat. You can tell that the system is losing 75 joules of work because as you push against your surroundings to perform expansion work, you are using up energy.
You can now connect those in and find a heat solution. The indicator on your heat indicates which way the flow was.
Positive indicates that internal energy increased, which caused heat to be sent to the system; negative indicates that internal energy decreased, which, if true, caused energy to leave the system by way of heat.
Now, 300 = q-75
The terms exothermic and endothermic simply signify whether or not heat is entering or exiting the system. In this scenario, which is positive, we can thus conclude that it is endothermic because it absorbed heat.
what in exothermic?
When energy is released as heat or light, the reaction is said to be exothermic. An exothermic reaction releases energy into the environment as opposed to an endothermic process, which absorbs energy from its surroundings.
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+375 J was transferred in exothermic and in which direction, to or from the system.
What in exothermic?
Exothermic reactions are those in which energy is discharged as heat or light. An exothermic reaction releases energy into the environment as opposed to an endothermic process, which absorbs energy from its surroundings.
According to first law of thermodynamics,
dE = Q – W
Where
Q = amont of heat = ?
dE = change in internal energy = +300 J
W = work done = +75 J Since work is done by the system
Plug the values we get
Q = dE + W
= +300 J + 75 J
= +375 J
Since Q is +ve so heat is transferred from the system
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