Molecular mass and the concept of mole
Molecular mass and the concept of mole: Overview
This topic covers concepts such as molecular mass, calculation of molecular mass of compounds, Avogadro's number, relation between mole and number of particles, and calculation of number of moles from given mass.
Important Questions on Molecular mass and the concept of mole
Two valence electrons are present in the oxygen atom.
The electronic configuration of chlorine is . How many valence electrons are present in chlorine atom?
How many valence electrons are present in the oxygen atom?
How many valence electrons are present in the oxygen atom?
What is the anion in calcium oxide?
The charge on oxygen ion is .
The charge on oxygen ion is _____.
Identify the charge on oxygen.
What is the cation for calcium oxide?
The charge on calcium is _____.
The charge on calcium ion is _____.
Identify the charge on calcium.
of water and of oxygen gas contain same number of molecules.
Complete the following table.
| Element | Atomic mass | Mass in grams | GAM | No. of atoms |
| Carbon | ||||
| Oxygen | ||||
| Nitrogen | _____ | _____ | ||
| Chlorine | _____ | _____ |
What is the value of Avogadro’s number?
Elements of which block shows variable valency in periodic table?
What do you mean by variable valency? Write two examples of elements showing variable valency.How can an atom show variable valency?
Give reasons.
Some elements have variable valencies.
Which of the following has variable valency?
_____ is considered internationally a standard way to express large number of chemical units.
