The number of atoms in one molecule of sulphur is

On what basis is the modern atomic mass standard defined?

The equivalent weight of potassium permanganate $(KMnO_4)$ in an acidic solution is:

$74.5 \ g$ of a metallic chloride contains $35.5 \ g$ of chlorine. What is the equivalent mass of the metal?

An element,$X$ has the following isotopic composition:
$^{200}X: 90\%$,$^{199}X: 8.0\%$,$^{202}X: 2.0\%$
The weighted average atomic mass of the naturally occurring element $X$ is closest to......$amu$.

The molecular weight of a tribasic acid is $M$. What will be its equivalent weight?