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

Options

A. `1.00 M`
B. `1.75 M`
C. `0.975 M`
D. `0.875 M`

Answer

4

Explanation

Molarity`=("Total moles")/("Total volume")`
`=(M_(1)V_(1)+M_(2)V_(2))/(V_(1)+V_(2))`
`=((0.5 M)(750 mL)+(2M)(250 mL))/(750 mL+250 mL)`
` =375 "mmoles"+500 "mmoles"//1000 mL`
`=(875 "millimoles")/(1000 mL)`
`=0.875`