Measures of Concentration: Molality and Other Calculations Answers

The concentration of 150.0 mL of Na2CO3 is found to be 30.0 ppm. What mass of Na2CO3 is dissolved in the solution if the density of the solution is 0.750 g/mL?Use .

A researcher dilutes 30.0 mL of ethanol to 300.0 mL with distilled water. What is the percentage concentration by volume of the resulting solution?Use .

How many liters of water must be added to 5.40 g of sodium nitrate to create a solution that has a concentration of 3.81 g/L?Use .

A teacher wants to prepare a 0.010 ppm solution of arsenic pentoxide in the laboratory for calibrating a water quality testing system. If the teacher uses 500.0 mL of water (which has a mass of 500.0 g), what mass of arsenic pentoxide should the teacher mix to get the required solution?Use .

A solution is made by dissolving 0.611 mol of NaCl in 250 g of water. If the molar mass of NaCl is 58.44 g/mol, what is the molality of the solution?Use .

Juanita dissolves 46 g of MgBr2 (molar mass: 184.11 g/mol) in 0.5 kg of distilled water. What is the molality of the solution?Use .

Given that the density of water is 0.975 g/mL and that 171 g of sucrose (molar mass: 342.30 g/mol) is dissolved in 512.85 mL of water at 80°C, what is the molality of this solution?Use .

A doctor orders a blood sample from a child to test for traces of lead in the blood. Which of the following concentration units would best meet this need?

A glucose solution that is prepared for a patient should have a concentration of 180 g/L. A nurse has 18 g of glucose. How many liters of water should she add to the glucose to obtain the required solution? Use .

A sugar solution containing 0.84 mol sugar has a concentration of 1.20 m. How many kilograms of water must the solution contain?Use .