Answer:
The correct answer is 150 kilograms.
Explanation:
Based on the given information, the ratio of zinc and copper within the alloy is 2:5. The amount of zinc used in the alloy is 60 kg. Now the amount of copper used within the alloy would be,
Zinc/Copper = 2/5
60/Copper = 2/5
Copper(Cu) = 60*5/2
Cu = 150 Kilograms.
Thus, the amount of Cu used in the alloy is 150 Kg.
Answer: Option (c) is the correct answer.
Explanation:
According to the Born-Lande equation,
E = 
where, 
= Avogadro's constant
r = distance between the anion and cation
M = Medlung constant
= charge on the cation
= charge on the anion
E = lattice energy
According to this expression, lattice energy is inversely proportional to the distance between the cation and anion. And, when we move down a group then there occurs an increase in the atomic radii of the atoms.
As a result, there will occur a decrease in their lattice energy. Since, the anionic part is same in all the given species but the cationic part is different.
In 
the size of magnesium cation is smaller than calcium, barium and strontium ion. Hence, there will be least distance between Mg and Br ions.
Thus, we can conclude that the magnitude of lattice energy will be the highest in .
Charges is then there is a negative sign at the right corner of an element it means you have to add, and when it is positive, it means you have to substract
F- due to the fact that it has one more electron.
Hope this helps and good luck :)
The answer is (4) CH3CH2OH and CH3OCH3. You need to figure out which pair has the same molecular formula which means that they have the same number of same atoms. Then you can get the write answer.
