Which method is used to determine the molecular mass of a volatile substance?

The amount of $K_2Cr_2O_7$ (equivalent weight $49.04$) required to prepare $100 \ mL$ of its $0.05 \ N$ solution is ........ $g$.

$0.1$ mol of the following given antiviral compound $(P)$ will weigh $......... \times 10^{-1} \ g$
$Given :$ molar mass in $g \ mol^{-1} H: 1, C: 12, N: 14, O: 16, F: 19, I: 127$

In $1 \ g$ of a metal oxide,the mass of metal precipitated is $0.68 \ g$. What is the equivalent weight of the metal?

An element has two main isotopes of mass numbers $85$ and $87$. In nature,they occur in the ratio of $75\%$ and $25\%$ respectively. The atomic weight of the element will be approximately:

The equivalent mass of a certain bivalent metal is $20$. The molecular mass of its anhydrous chloride is