The molarity of a solution obtained by mixing 750mL of 0.5 M HCl with 250mL of 2M HCl will be

From  the formula  ${\mathrm{M}}_{\mathrm{final}}$=$\frac{{\mathrm{M}}_1{\mathrm{V}}_1+{\mathrm{M}}_2{\mathrm{V}}_2}{{\mathrm{V}}_1+{\mathrm{V}}_2}$

Given ${\mathrm{V}}_1$=750 mL,${\mathrm{V}}_2$=250 mL

           ${\mathrm{M}}_1$= 0.5 M, ${\mathrm{M}}_2$= 2M

${\mathrm{M}}_{\mathrm{final}}$ =$\frac{750\mathrm{x}0.5+250\mathrm{x}2}{750+250}$=0.875 M