Dumbledore decides to gives a surprise demonstration. He starts with a hydrate of Na2CO3 which has a mass of 4.31 g before heating. After he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. He asks everyone in class to determine the integer x in the hydrate: Na2CO3·xH2O; you should do this also. Round your answer to the nearest integer.

Answer : The integer 'x' in the hydrate is, 2

Explanation : Given,

Mass of hydrate = 4.31 g

Mass of anhydrous = 3.22 g

First we have to calculate the mass of water.

Mass of water = Mass of hydrate - Mass of anhydrous

Mass of water = 4.31 g - 3.22 g

Mass of water = 1.09 g

Now we have to calculate the moles of and

Molar mass of = 18 g/mol

and,

Molar mass of = 106 g/mol

Now we have to calculate the ratio of and

The formula of compound is,

The value of 'x' is, 2

So, the formula of compound is,

Thus, the integer 'x' in the hydrate is, 2

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.