Which statement describe a closed circuit
1 answer:
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Answer:
4.2s
Explanation:
Given parameters:
Power = 2190W
Mass of box = 1.47 x 10⁴g
distance = 6.34 x 10⁴mm
Unknown:
Time = ?
Solution:
Power is the rate at which work is done;
Mathematically;
Power =
Time =
Work done = weight x height
convert mass to kg;
100g = 1kg;
1.47 x 10⁴g = 14.7kg
convert the height to m;
1000mm = 1m
6.34 x 10⁴mm gives 63.4m
Work done = 14.7 x 9.8 x 63.4 = 9133.4J
Time taken = = 4.2s
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