Write about Formula Mass.

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(N/A) Some substances such as sodium chloride $(NaCl)$ do not contain discrete molecules as their constituent units.In such compounds,positive (sodium

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(N/A) Some substances such as sodium chloride $(NaCl)$ do not contain discrete molecules as their constituent units.
In such compounds,positive (sodium) and negative (chloride) ions are arranged in a three-dimensional structure.
It may be noted that in sodium chloride,one $Na^+$ ion is surrounded by $six$ $Cl^-$ ions and vice-versa.
The formula such as $NaCl$ is used to calculate the formula mass instead of molecular mass,as in the solid state,sodium chloride does not exist as a single discrete entity.
Thus,
Formula mass of sodium chloride = Atomic mass of sodium + Atomic mass of chlorine
$= 23.0 \ u + 35.5 \ u = 58.5 \ u$

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