Question

Five years ago a man was eight times as old as his son. Five years hence, the father will be thrice the age
of his son. Find their present age.
A total of 80,000 is to be distributed among 200 persons as prizes. A prize is either 500 or 300
Find the number of each type of prizes.
1
fis subtracted from a number and the difference is multiplied by 5, the result is 45. Find the number
f the sum of three consecutive odd numbers is 81. Find the greatest odd number of this series.
The age difference between eldest and youngest is equal to the youngest. Find the age of all. If the
Foungest is 36 years younger than the eldest and the ratio of eldest and youngest is 9:5.
um of four consecutive even numbers is 140. Then, find the numbers.
The age of Paul and Kirat is in the ratio of 3:2. Five years hence, their ages will in the ratio of 10:7. Find
heir ages five years hence.
he age of father and his son is in the ratio of 4 : 1. The sum of their ages is 60. Find their ages two years
go.
and the numbers whose sum and difference are 117 and 45, respectively,​

Answer 1

For NaCl, lattice energy = - 186 Kcal/mol, the salvation energy of Na + and Cl - are

-97 and -85 kcal/mole respectively. Therefore for NaCl ( s )

Ans :

4 kcal/mol

But I want a detailed soln plz explain

Answer 2

Answer:

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