The number of electrons in one molecule of $CO_2$ is:

Use the data given in the following table to calculate the molar mass of naturally occurring argon isotopes:

Isotope	Isotopic molar mass $(g \, mol^{-1})$	Abundance (%)
$^{36}Ar$	$35.96755$	$0.337$
$^{38}Ar$	$37.96272$	$0.063$
$^{40}Ar$	$39.9624$	$99.600$

$71 \ g$ 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:

The mass of one molecule of oxygen is equal to $..... \ kg$.

At $STP$,if $5.6 \ L$ of a gas weighs $7.5 \ g$,then identify the gas.

The unit of atomic mass,$amu$ is replaced by $u$,here $u$ stands for