What is the percent by mass of a solution made by dissolving 55.0 g KCI in 125 g

Question

What is the percent by mass of a solution made by dissolving 55.0 g KCI in 125 g 30.6% 68.80% 55.0% 56.0% Calculate the molality of methanol in a solution prepared by dissolving 75.0 mL methanol. CH_3OH. (d = 0.791g/mL) in 150 g ethanol 19.8 156 0.0156 12.3 Which concentration unit varies with temperature? mass percent molarity mole fraction molality Which of the following hypothetical steps is predicted to be exothermic? pure solvent rightarrow separated solvent molecules pure solute rightarrow separated solute molecules separated solvent and solute molecules rightarrow solution pure solvent and pure solute rightarrow heterogeneous mixture

Explanation / Answer

1) Percent by mass = (55/180) x 100 = 30.6%

Answer : a) 30.6%

2) molality = moles/kg of solvent

= 75 ml x 0.791 g/ml/32.04 g/mol x 0.150 kg = 12.3 m

Answer : d) 12.3

3) Concentration unit which is temperature dependent is,

c) molarity

4) The predicted exothermic steps are,

c) separated solvent and solute molecules ---> solution

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