Explain: Molar mass
Answers
Answer:
What Is Molar Mass?
Relative molar mass is defined as the smallest mass unit of a compound with one twelfth of the mass of one carbon – 12 atom.
In a substance, the amount of entities present for e.g. atoms, molecules, ions, is defined as a mole. A mole of any substance is 6.022×1023 molecules. Just as we take a standard value to calculate different things e.g. 1 dozen =12 items similarly we use the mole to calculate the size of the smallest entities quantitatively.
Mole Definition
In chemistry, the mole is a fundamental (SI) unit used to measure the amount of substance. This quantity is sometimes referred to as the chemical amount.
A substance is something that has mass and occupies space. The molar mass/molecular weight is actually the sum of the total mass in grams of the atoms present to make up a molecule per mole. The unit of molar mass is grams/mole.
Molar Mass Unit
The standard unit for this is g mol−1. However, the SI unit is kg mol−1, which is very rare.
Mole Concept
The amount of atoms present in 12g (0.012 kg) of the 12C isotope is the number of particles present in 1 mole of the substance. One of the most important facts that should be kept in mind is that the mole of a substance always contains the same number of entities whatever the substance may be.
To know the number precisely the mass of carbon-12 atom was calculated by using a mass spectrometer and it was found to be 1.992648×10−3g.
As we know that one mole of carbon weighs 12g, the total no. of atoms in it is equal to 6.0221367×1023. The no. of entities in 1 mole plays a vital role in calculations in chemistry. That is why it is given a name called Avogadro’s number(NA). From the above discussion, we can say that the number of atoms present in 1 mole of hydrogen is equal to 6.022×1023.
Answer:
the mass occupied by 1 mol of a substance is called its molar mass.