The average mass of an atom of the element compared to \(\dfrac{1}{12}\) of the mass of one carbon-12 (C-12) atom.
\(\,\\\dfrac{\text{Average mass of one atom}}{\dfrac{1}{12} \times \text{Mass of one C-12 atom}} \\ \,\\\)
The average mass of a molecule of the element compared to \(\dfrac{1}{12}\) of the mass of one carbon-12 atom.
\(\,\\\dfrac{\text{Average mass of one molecule}}{\dfrac{1}{12} \times \text{Mass of one C-12 atom}} \\ \,\\\)
RMM of oxygen gas, \(O_2\)
= 2(RAM for \(O\))
= \(2(16)\)
= \(32\)
[Relative formula mass: \(O=16, Al=27, S=32, Cl=35.5, Zn=65\)]
RFM for zink chloride, \(ZnCl_2\)
= RAM of \(Zn\) + \(2\)(RAM of \(Cl\))
=\(65+2(35.5)\)
= \(65+71\)
=\(136\)
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