G.chem

What is the molecular mass (amu) of an aspirin molecule with the chemical formula C9H8O4?

• 120.19

• 150.24

• 180.16

• 135.21

What is the formula mass (amu) of aluminum sulfate, an ionic compound used in various processes?

• 159.67

• 233.43

• 278.21

• 342.15

What is the empirical formula of a compound if a sample contains 0.130 g of nitrogen and 0.370 g of oxygen?

• NO2

• N2O

• N2O5

• NO

What is the molarity of a soft drink sample containing 0.133 mol of sucrose in a 355 mL solution?

• 0.425 mol/L

• 0.250 mol/L

• 0.500 mol/L

• 0.375 mol/L

What is the final concentration of a LiCl solution after diluting 175 mL of a 1.6 M solution to a final volume of 1.0 L?

• 0.28 M

• 0.40 M

• 0.32 M

• 0.45 M

What is the percentage by mass of glucose in a 5.0-g sample of spinal fluid containing 3.75 mg of glucose?

• 30%

• 75%

• 45%

• 60%

Calculate the concentration of ethanol in water by volume/volume (v/v) in a 200 mL solution containing 36 mL ethanol.

• 18%

• 25%

• 22%

• 30%

What is the mass-volume percentage of NaCl in a solution prepared by mixing 10 g of NaCl in 500 mL of solution?

• 4%

• 8%

• 2%

• 6%

What is the parts per million (ppm) concentration if a solution has 5 g of solute in 1,000,000 g of solution?

• 500 ppm

• 50 ppm

• 5 ppm

• 0.5 ppm

Calculate the parts per billion (ppb) concentration of a solution with 3 g of solute in 1,000,000,000 g of solution.

• 0.003 ppb

• 0.03 ppb

• 0.3 ppb

• 3 ppb