The atomic mass of a metal is $27$ and its equivalent mass is $9$. What is the formula of its chloride?

The equivalent weight of an acid:

If $V \ mL$ of the vapours of a substance at $NTP$ weigh $W \ g$,find the molecular weight of the substance.

$71 \ g$ of chlorine combines with a metal to form $111 \ g$ of its chloride. The chloride is isomorphous with $MgCl_2 \cdot 6H_2O$. The atomic weight of the metal is:

What is the average atomic mass of chlorine if its two isotopes $^{35}Cl$ and $^{37}Cl$ exist in a relative abundance of $75\%$ and $25\%$ respectively?

On what basis is the modern atomic mass standard defined?