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Relative Mass of Atom and Molecule
Relative Atomic Mass (RAM)
Relative atomic mass is the mass of one atom of an element compared to 1/12 that of the mass of an atom of Carbon-12. The relative atomic mass of carbon-12 is taken to be 12.
Answer
Relative Atomic Mass of Sodium
= 23
Answer
Relative Atomic Mass of X
= 13 x 4 = 52
Answer
Relative mass of 2 bromine atom = 2 x 80 = 160.
Relative mass of 4 neon atom = 4 x 20 = 80.
The mass of 4 neon atom is 160/80 = 2 times greater than 2 bromine atom.
Relative Molecular Mass (RMM)
Relative molecular mass is the mass of one molecule of an element or compound compared to that of the mass of an atom of Carbon-12. The relative atomic mass of carbon-12 is taken to be 12.
Finding Relative Molecular Mass
A relative molecular mass can be calculated easily by adding together the relative atomic masses of the constituent atoms.
( Mr: O = 16, S = 32; Al = 27 )
Answer
Relative Formular Mass of Aluminium Sulphate
= 2(RAM of Aluminium) + 3[RAM of Sulphur + 4(RAM of Oxygen)]
= 2(27) + 3[32 + 4(16)] = 327
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