Explanation:
As atomic number of hydrogen is 1. So, it needs to gain one electron from a donor atom in order to become stable in nature.
Therefore, when a hydrogen bond is formed with a non-hydrogen atom then there must be presence of a non-bonding electron.
For example, atomic number of nitrogen atom is 7 and its electronic distribution is 2, 5.
Here, three electrons are needed by a nitrogen atom. And, when three nitrogen atoms get attached to a nitrogen atom then a compound is formed.
Thus, we can conclude that to form a hydrogen bond, the non-hydrogen atom ( N , O , or F ) involved in the bond must possess a non-bonding electron pair.
Given parameters:
mass of an empty beaker = 65gm
mass of the beaker and water = 165gm
volume of water = 100cm³
Unknown:
Density of water = ?
Solution:
Density is the mass per unit volume of a substance;
Density =
To find the mass of the water ;
Mass of water = Mass of beaker and water - mass of an empty beaker
= 165g - 65g
= 100g
So input parameters and solve;
Density =
Density of the water in the beaker = 1g/cm³