What is the molecular mass of substance and how it is calculated ?
The average mass of a molecule of a substance is termed as its molecular mass (M). The molecular mass has the unit of mass, viz., gram, kilogram, atomic mass unit, etc.
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How is the formula mass of an ionic substance calculated ?
For ionic compound, such as, sodium chloride, there is no discrete individual molecule. Instead, these are the aggregates represented by a formula of the type..
How many moles are there in a certain volume of a gaseous substance ?
To calculate the number of moles of a gaseous substance in a certain volume, we use the relationship that one mole of any gaseous substance under NTP conditions occupies 22.4 liter (L), or 22400 ml of volume.
How many moles are there in a certain mass of a substance?
Number of moles of substance in a certain mass of a substance may be obtained as follows. Mass of the substance = Wg
What do you mean by Thermionic Emission?
Thermionic emission is the emission of electrons from a heated filament or substance.