The following five beakers, each containing a solution of sodium chloride (nacl, also known as table salt), were found on a lab shelf:
beaker contents
1) 200. ml of 1.50 m nacl solution
2) 100. ml of 3.00 m nacl solution
3) 150. ml of solution containing 19.5 g of nacl
4) 100. ml of solution containing 19.5 g of nacl
5) 300. ml of solution containing 0.450 mol nacl
arrange the solutions in order of decreasing concentration.

The solutions in order of decreasing concentration:

(IV) > (II) > (III) > (I)  = (V)

Explanation:

1) 200 mL of 1.50 M NaCl solution  - (I)

Concentration of NaCl is given , [NaCl]= 1.50 M

2) 100 mL of 3.00 M NaCl solution  - (II)

Concentration of NaCl is given , [NaCl]= 3.00 M

3) 150 mL of solution containing 19.5 g of NaCl  - (III)

Moles of NaCl =

Volume of solution = 150 mL = 0.150 (1L = 1000 mL)

4) 100 mL of solution containing 19.5 g of NaCl  - (IV)

Moles of NaCl =

Volume of solution = 100 mL = 0.100 (1L = 1000 mL)

5) 300 mL of solution containing 0.450 mol NaCl - (V)

Moles of NaCl = 0.450 mol

Volume of solution = 300 mL = 0.300 (1L = 1000 mL)

The solutions in order of decreasing concentration:

(IV) > (II) > (III) > (I)  = (V)

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