I believe that for this item, the unit m is for the molality which is equal to mole of solute to kg of solvent. For water that is 670 g, the equivalent in kg is equal to 0.670 kg. Then using the equation, molality = moles solute / kg solvent and substituting the known values, 2.13 = moles solute / 0.670 kg The amount of solute should be 1.4271 moles. Then, we multiply this value with the molar mass of KBr which is equal to 119.002 g/mol. The answer would be 169.83 g.
It took mark 2 hours to ride his bike to his grandma's house, which was 12 miles away. I divided 2 by 12 and got 6. Remember this: mph = miles away ÷ time.
