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

When the weights of two elements combine with each other,their ratio is the ratio of their ......

Calculate the atomic mass (average) of chlorine using the following data:

Isotope	$\%$ Natural Abundance	Molar Mass $(g/mol)$
$^{35}Cl$	$75.77$	$34.9689$
$^{37}Cl$	$24.23$	$36.9659$

(in $u$)

The atomic mass of an element is $27$. If its valency is $3$,what is the vapor density of its volatile chloride?

If the equivalent weight of a metal $(M)$ is $x$ and the formula of its oxide is $M_mO_n$,then the atomic weight of $M$ is ......

In order to prepare one litre of a $1 \ N$ (normal) solution of $KMnO_4$,how many grams of $KMnO_4$ are required if the solution is used in an acidic medium for oxidation?