What is the average speed of a vehicle that covers 250 miles in two-and-a-half hours?
1 answer:
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Answer : The magnitude of the lattice energy for CsCl is, 667 KJ/mole
Explanation :
The steps involved in the born-Haber cycle for the formation of :
(1) Conversion of solid calcium into gaseous cesium atoms.
= sublimation energy of calcium
(2) Conversion of gaseous cesium atoms into gaseous cesium ions.
= ionization energy of calcium
(3) Conversion of molecular gaseous chlorine into gaseous chlorine atoms.
= dissociation energy of chlorine
(4) Conversion of gaseous chlorine atoms into gaseous chlorine ions.
= electron affinity energy of chlorine
(5) Conversion of gaseous cations and gaseous anion into solid cesium chloride.
= lattice energy of calcium chloride
To calculate the overall energy from the born-Haber cycle, the equation used will be:
Now put all the given values in this equation, we get:
The negative sign indicates that for exothermic reaction, the lattice energy will be negative.
Therefore, the magnitude of the lattice energy for CsCl is, 667 KJ/mole
c. -98 m/s
The motion of the rock is a uniformly accelerated motion (free fall) with constant acceleration (negative since it is downward). Therefore, we can find its velocity using the following suvat equation
where
v is the final velocity
u is the initial velocity
g is the acceleration of gravity
t is the time
For the rock in the problem,
u = 0
So, its velocity at t = 10 s is
where the negative sign indicates that the velocity points downward.
d. -490 m
Since the motion is at constant acceleration, we can use another suvat equation:
where
s is the displacement
u is the initial velocity
g is the acceleration of gravity
t is the time
Substituting:
u = 0
t = 10 s
We find the rock's displacement:
where the negative sign means the displacement is downward.