Asample of a hydrated compound has a mass of 5.1 g. during heating, it loses 1.1 g, leaving 4.0 g. what is the percentage by mass of water in the original hydrate?

6.11%
21.6%
27.5%
78.4%

21.6%

Explanation: From given information, mass of hydrate is 5.1 g. It loses water on heating. So, mass of water in the hydrate is 1.1 g.

(4.0 g is the mass of the unhydrated salt which is not of our use to solve this problem.)

Percent by mass of water in the original hydrate is the mass of water divided by the mass of hydrate and multiplied by 100.

water percentage in hydrate =

water percentage in hydrate =

water percentage in hydrate = 21.6%

So, choice C) 21.6% is correct.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

the answer is b. dilution