The average molecular weight of the air which has $21 \%$ of $O_2$ and $79 \%$ of $N_2$, is

What is the weight of $1$ atom of $H$ in grams? (Atomic mass of $H = 1.008$)

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

If we consider that $1/6$ of the mass of a carbon atom,in place of $1/12$,is taken to be the relative atomic mass unit,the mass of one mole of a substance will

Chlorine has two naturally occurring isotopes,${}^{35}Cl$ and ${}^{37}Cl$. If the atomic mass of $Cl$ is $35.45$,the ratio of natural abundance of ${}^{35}Cl$ and ${}^{37}Cl$ is closest to (in $: 1$)

Upon fully dissolving $2.0 \ g$ of a metal in sulphuric acid,$6.8 \ g$ of the metal sulphate is formed. The equivalent weight of the metal is $...... \ g$.