A solution is prepared by dissolving 15.0 g of ammonia in 250 g of water. The de

Question

A solution is prepared by dissolving 15.0 g of ammonia in 250 g of water. The density of the resulting solution is 0.974 g/mL. The molarity of in the solution is __________.

A) 0.00353

B) 0.882

C) 60.0

D) 3.24

A solution is prepared by dissolving 23.7 g of NaCl in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of NaCl is __________% by mass.

A) 5.94

B) 6.32

C) 0.0632

D) 0.0594

The concentration (M) of HCl in the solution prepared by dissolving 5.5 g of HCl in 200 g of water is __________ M. The density of the solution is 0.79 g/mL.

A) 21

B) 0.93

C) 0.58

D) 6.0 ×

Explanation / Answer

The common formula can be applied in all these cases is

Molarity = (weight / molecular weight) x (1000 / volume in milli liters)

Answers:

1) = D (60.0)

2) = B (6.32)

3) = C (0.58)

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