Below are the choices that can be found elsewhere:
a. 268 kJ
<span>b. 271 kJ </span>
<span>c. 9 kJ </span>
<span>d. 6 kJ
</span>
So the key thing to realize here is what the information given to you actually means. Sublimation is going from a sold to a gas. Vaporization is going from a liquid to a gas. Hence you can create two equations from the information that you have:
<span>Ga (s) --> Ga (g) delta H = 277 kJ/mol </span>
<span>Ga (l) --> Ga (g) delta H = 271 kJ/mol </span>
<span>From these two equations, you can then infer how to get the melting equation be simply finding the difference between the sublimation (two steps) and vaporization (one step). </span>
<span>Ga (s) --> Ga (l) delta H = 6 kJ/mol </span>
<span>At this point, all you need to do is a bit of stoichiometry. You start with 1.50 mol and multiply by the amount of energy per mole (6 kJ/mol). </span>
<span>*ANSWER* </span>
<span>9 kJ/mol (C)</span>
Answer:
so that it can diverge the light to make sure that it focused on the ratina and the image is formed.
Explanation:
nearsightedness is when the light is focused in front of the ratina and for an image to be formed in the eye, the light must be focused on the ratina so to correct that we use the diverging lenses so that it will diverge the light and allow the cornea and the lens to converge it so it is focused on the ratina.
Answer:
(a) Potential energy of the child is converted into the kinetic energy at the bottom off the slide and a part of which is lost into friction generating heat between the contact surfaces.
(b) ![U=668.16\ J](https://tex.z-dn.net/?f=U%3D668.16%5C%20J)
Explanation:
Given:
- mass of the child,
![m=24\ kg](https://tex.z-dn.net/?f=m%3D24%5C%20kg)
- height of the slide,
![h=3.3\ m](https://tex.z-dn.net/?f=h%3D3.3%5C%20m)
- initial velocity of the child at the slide,
![v_i=0 m.s^{-1}](https://tex.z-dn.net/?f=v_i%3D0%20m.s%5E%7B-1%7D)
- final velocity of the child at the bottom of slide,
![v_f=3\ m.s^{-1}](https://tex.z-dn.net/?f=v_f%3D3%5C%20m.s%5E%7B-1%7D)
(a)
∴The initial potential energy of the child is converted into the kinetic energy at the bottom off the slide and a part of which is lost into friction generating heat between the contact surfaces.
Initial potential energy:
![PE=m.g.h](https://tex.z-dn.net/?f=PE%3Dm.g.h)
![PE=24\times 9.8\times 3.3](https://tex.z-dn.net/?f=PE%3D24%5Ctimes%209.8%5Ctimes%203.3)
![PE=776.16\ J](https://tex.z-dn.net/?f=PE%3D776.16%5C%20J)
Kinetic energy at the bottom of the slide:
![KE=\frac{1}{2} m.v^2](https://tex.z-dn.net/?f=KE%3D%5Cfrac%7B1%7D%7B2%7D%20m.v%5E2)
![KE= 0.5\times 24\times 3^2](https://tex.z-dn.net/?f=KE%3D%200.5%5Ctimes%2024%5Ctimes%203%5E2)
![KE= 108\ J](https://tex.z-dn.net/?f=KE%3D%20108%5C%20J)
(b)
Now, the difference in the potential and kinetic energy is the total change in the thermal energy of the slide and the seat of her pants.
This can be given as:
![U=PE-KE](https://tex.z-dn.net/?f=U%3DPE-KE)
![U=776.16-108](https://tex.z-dn.net/?f=U%3D776.16-108)
![U=668.16\ J](https://tex.z-dn.net/?f=U%3D668.16%5C%20J)
As they grow up, they will separate with their mother and tend to their own self. They will learn to catch fish and stay alert for predators. Eventually, they will find their own mate and produce their own offspring.