http://www.chemguide.co.uk/CIE/ exactly as the syllabus !I want exact definitions of relative atomic, isotopic, molecular and formula
masses, based on the 12C scale the way is should be answered ASAP! Thanks in advance
The relative atomic mass of an element is the weighted average of the masses of its isotopes on a scale on which a carbon-12 atom has a mass of exactly 12 units.
The relative isotopic mass of an isotope is the mass of the isotope on a scale on which a carbon-12 atom has a mass of exactly 12 units.
The relative molecular mass of a substance is the weighted average of the masses of the molecules on a scale on which a carbon-12 atom has a mass of exactly 12 units.
The relative formula mass of a substance is the weighted average of the masses of the formula units on a scale on which a carbon-12 atom has a mass of exactly 12 units.