Question

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

Answer 1

Answer: A) .346 M

Step-by-step 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