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

Chlorine has two isotopes $^{35}Cl$ and $^{37}Cl$ with an average atomic mass of $35.5$. What is the ratio of their relative abundance respectively?

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 $u$)

$5 \, mol$ of $AB_2$ weigh $125 \times 10^{-3} \, kg$ and $10 \, mol$ of $A_2B_2$ weigh $300 \times 10^{-3} \, kg$. The molar mass of $A$ $(M_A)$ and molar mass of $B$ $(M_B)$ in $kg \, mol^{-1}$ are:

The unit of atomic weight is

$0.126 \ g$ of an acid requires $20 \ mL$ of $0.1 \ N$ $NaOH$ for complete neutralization. The equivalent weight of the acid is: