A mole is a measurement of a ‘batch’ of particles. It is easier to describe the number of moles of a substance rather than the number of atoms as atoms are very small. Relative atomic mass is the ...

Get the CBSE Class 9th Science chapter, Atoms and Molecules: Important topics and questions to prepare for CBSE Class 9 Science Examination, 2017-2018. This will provide you with a very clear idea ...

As with metal ores, it is useful to be able to calculate exactly what proportion the essential nutrients accounts for in a fertiliser. Ammonium nitrate (NH 4 NO 3) is commonly used as a fertiliser.