Question

plz plz gives me the solution of this question by table method​

Answer 1

Answer:

Explanation:

The formula of the salt will be $MSO _{4} .nH _{2} O$

Molar mass of the salt will be = 65.4+32+4×16 + n×18 = 161.4+18 n

On dehyration, all $H_{2} O$ molecules will evaporate and the formula of the salt becomes $MSO_{4}$

having molar mass 161.4

Therefore, we can say that

35.85% of (161.4+18n) = 161.4

or, 35.85100×(161.4+18n)=161.4

or, 161.4+18n =$\frac{161.4*100}{35.85}$

or, 161.4+18n = 450.20

or 18 n = 450.20−161.4 = 288.80or, n =$\frac{288.80}{18} =16$

Hence, the number of molecules of water of crystallisation = 16​