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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