According to the equation  ${\mathrm{SnO}}_2+2{\mathrm{H}}_2\to \mathrm{Sn}+2{\mathrm{H}}_2\mathrm{O}$
What volume of hydrogen, measured at 1 atm and 273 K, is required to react with 2.00 g of  ${\mathrm{SnO}}_2$ ?

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

$2\mathrm{gm}\Downarrow$

$\frac{2}{151}\text{mol\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}}\frac{4}{151}\text{mol}$

$\Downarrow$

$\frac{4}{151}\times 22.4\text{lit}$

$=0.593\text{lit}$