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

The $2\,N$ aqueous solution of $H_2SO_4$ contains

The weight of $1 \ L$ of an unknown gas at $N.T.P.$ is $1.25 \ g$. Which of the following gases can be identified from the given information?

Calculate the molar mass of naturally occurring argon from the data given in the following table:

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

If a metal oxide contains $32\%$ oxygen,what is the equivalent mass of the metal?

$4 \ g$ of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave $5 \ g$ of its oxide. The equivalent weight of copper is