High School

ch 12. a potassium bromide solution is 7.55% potassium bromide by mass, and its density is 1.03 g/mL. what mass of potassium bromide is contained in 35.8 mL of the solution?

a. 2.78

b. 2.70

c. 4.88

d. 2.62

Answer :

Mass is a dimensionless quantity which represents the amount of matter present in a particle or object. The SI unit of mass is kilogram (kg). The mass of potassium bromide contained in 35.8 mL of the solution is 2.78. The correct option is A.

The equation connecting the density, mass and volume is given as:

Density = Mass / Volume

Mass = Density × Volume

Mass = 1.03 g/mL × 35.8 mL

Mass = 36. 874 g

Total mass of potassium bromide, M = m × P%

M = 36. 874 × 7.55/ 100 %

M = 2.78

Thus the correct option is A.

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