Chemistry, 07.04.2020 23:18 tynyiaawrightt

An automobile engine provides 639 Joules of work to push the pistons and generates 2194 Joules of heat that must be carried away by the cooling system. Calculate the change in the internal energy of the engine. E = Joules

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Answer from: batista68

The change in the internal energy of the system (engine) is -2,833 J.

The given parameters;

work by the system, w = 639 Jheat removed from the system, q = 2194 J

The change in the internal energy of the system (engine) is calculated by applying first law of thermodynamics;

ΔU = q + w

where;

q is the heat added to the systemw is the work done on the system

ΔU = -(2194 J) + -(639 J)

ΔU = - 2194 J - 639 J

ΔU = -2833 J

Thus, the change in the internal energy of the system (engine) is -2,833 J.

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Answer from: maddylucas

The change in the internal energy of the engine is - 2833 J

Explanation:

According to first law of thermodynamics:

$\Delta E=q+w$

$\Delta E$ = Change in internal energy

q = heat absorbed or released

w = work done or by the system

w = work done by the system= $-P\Delta V$ = -639 J {Work is done by the system and is negative as the final volume is greater than initial volume }

q = -2194 J {Heat released by the system is negative}

$\Delta E=-639+(-2194)J=-2833J$

Thus the change in the internal energy of the engine is - 2833 J

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For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

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