Chemistry Homework Help

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Calculate Molarity

#### Q. A chemist prepares a solution of iron(III) bromide (FeBr3) by measuring out 276. g of iron(III) bromide into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's iron(III) bromide solution. Round your answer to 3 significant digits.

Solved • Sep 13, 2019

Calculate Molarity

#### Q. 1a. How many grams of methanol (CH3OH) are required to make 250mL of a 0.25M solution? (Remember that M is molarity which is moles of solute/L of solution) b. With the aid of a diagram of a volumetric flask, write out the instructions to prepare the solution in part a. (what equipment would you need in the lab and what would you do with it? – write a procedure) c. Explain why you cannot just add the mass you calculated in part a to 1L of water.

Solved • Sep 10, 2019

Calculate Molarity

#### Q. A bottle of wine contains 11.3% ethanol by volume. The density of ethanol (C2H5OH) is 0.789 g/cm^3. Calculate the concentration of ethanol in wine in terms of mass percent and molality. a) Mass percent = ___% b) Molality = ___ mol/kg

Solved • Aug 30, 2019

Calculate Molarity

#### Q. You have a 0.75mg/mL solution of bovine serum albumin (BSA). You add 1mL of the 0.5 mg/mL BSA solution into a standard cuvette (1cm path length), set your spectrophotometer to 280nm and read the absorbance of this BSA solution. What is the absorbance to three decimal places?

Solved • Aug 13, 2019

Calculate Molarity

#### Q. A student dissolves 3.3 g of biphenyl (C12H10) in 425. mL of a solvent with a density of 0.90 g/mL. The student notices that the volume of the solvent does not change when the biphenyl dissolves in it. Calculate the molarity and molality of the student's solution. Round both of your answers to 2 significant digits.

Solved • Jul 21, 2019

Calculate Molarity

#### Q. A 3.17m solution of CaCl2 in water has a density of 1.24 g/mL. What is the molarity? A) 2.91 M CaCl2 B) 3.50 M CaCl2 C) 2.56 M CaCl2 D) 3.93 M CaCl2

Solved • Jul 15, 2019

Calculate Molarity

#### Q. At 25.0°C, a solution has a concentration of 3.179 M and a density of 1.260 g/mL. The density of the solution at 50.0°C is 1.249 g/mL. What is the molarity of the solution at 50.0°C? A) 3.179 M B) 3.151 M C) 3.230 M D) 2.545 M

Solved • Jul 15, 2019