Ahygroscopic compound readily absorbs water from the air. this water can be removed by gently heating the compound. 5.24 g of a hygroscopic compound was heated to remove the absorbed water. after heating the dry compound had a mass of 4.16 g. what was the mass percent of water in the original compound?

This means 20.6% of the original hygrocopic compound is water

Explanation:

Step 1: Given data

A hygroscopic compound weighs 5.24 grams

To remove the absorbed water the compound is heated.

After the heating process, the compound weighs 4.16 grams

Step 2: Calculate the mass of the water

The total mass of the hygroscopic compound = mass of water + mass of dry compound

The mass of water = The total mass of the hygroscopic compound - mass of dry compound

The mass of water = 5.24 grams - 4.16 grams = 1.08 grams

Step 3: Calculate the mass percent of water in the original compound

1.08g / 5.24g *100% = 20.6%

Step 4: To control this we can calculate the mass percent of the dry compound

4.16g / 5.24g *100 % = 79.4%

20.6% + 79.4% = 100%

This means 20.6% of the original hygrocopic compound is water

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.