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22 December, 19:04

If 450.0 mL of a 0.500 M solution is mixed with 200.0 mL of water, what is the molarity of the new

solution?

A. 0.346 M

B. 0.625 M

C. 1. 86 M

D. 2.50 M

+2
Answers (1)
  1. 22 December, 21:43
    0
    Answer: A).346 M

    Explanation:

    Given:

    - 450 mL

    -.5 M soln

    -200 mL water

    1) Convert mL to L

    450 mL =.45 L

    200 mL =.2 L

    2) Find mols in solution

    .5 M = x/.45 L

    x =.225 mol

    3) Find total volume of solution

    .45 L +.2 L =.65 L

    4) Find new molarity

    molarity (M) = mols solute / L solution

    y =.225 mol (from step 2) /.65 L (from step 3)

    y =.346 M

    Answer: A).346 M
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