Let the molar mass of an element be $\mathrm{A}$ grams. Then, the mass of $10$ atoms of the element in $\mathrm{amu}$ is

Which of the following samples will have the same volume under similar conditions of temperature and pressure?

$\mathrm{a}.$ $64 \mathrm{g} {\mathrm{SO}}_2$

$\mathrm{b}.$ $4 \mathrm{g} \mathrm{He}$

$\mathrm{c}.$ $16 \mathrm{g} {\mathrm{O}}_2$

$\mathrm{d}.$ $6.023\times {10}^{23}$ molecules of ${\mathrm{N}}_2$.

The number of atoms in $3.2 \mathrm{g}$ of oxygen gas is

Calculate the amount of ${\mathrm{H}}_2$ which is left unreacted in the given reaction:

$2{\mathrm{H}}_2+{\mathrm{O}}_2\to 2{\mathrm{H}}_2\mathrm{O}$

if$8 \mathrm{g}$ of ${\mathrm{H}}_2$ is mixed with $16 \mathrm{g} {\mathrm{O}}_2$?