Question

The molarity of the solution obtained by mixing 750 ml of 0.5 M of Hcl with 250ml of 2M of Hcl is?

Answer 1

the molarity of a solution obtained by mixing 750ml of 2(M)HCl will be
the question is not complete
The molarity of a solution obtained by mixing 750 mL of 0.5 (M) HCl with 250 mL of 2(M)HCl will be
the no of moles in this solution is .750*2=1.5 mole
M=M1V1 +M2V2/V=.875M

Answer 2

$\displaystyle \sf \: M_{res}= \frac{M _{1} V_{1} + M _{2} V_{2}}{V_{1} + V_{2}}$

$\displaystyle \sf \: \qquad= \frac{750 \times 0.5 + 250 \times 2}{750 + 250}$

$\displaystyle \sf \: \qquad= \frac{357 + 500}{1000}$

$\displaystyle \sf \: \qquad= \frac{875}{1000}$

$\displaystyle \bf \: \qquad= 0.875$

$\:$