Question

A) Calculate the molality of a sucrose solution made by dissolving 73.1 grams sucrose into 55.3 grams water. The molar mass of sucrose is 342.2 g/mol. Record your answer in scientific notation using 3 significant figures. Use * for the multiplication symbol.

B) A sodium hydroxide solution that contains 55.5 grams of NaOH per L of solution has a density of 1.14 g/mL. Calculate the molality of the NaOH in this solution. Record your answer to 2 decimal spaces.

C) Calculate the concentration in ppm of lead in a solution that contains 198.7 mg Pb per 4.47 kg of solution. Record your answer to the nearest whole number.

D) What is the concentration of magnesium bromide, in ppm, if 104.48 g MgBr2 is dissolved in 7.82 L water. Record your answer in scientific notation to 3 significant figures.