chemistry

What is the correct term for the mass of a single molecule of a covalent substance?

• Atomic mass

• Molecular mass

• Empirical mass

• Molar mass

What is the molecular formula of chloroform (CHCl3)?

• C2HCl3

• CH2Cl

• C2H3Cl

• CHCl3

What is the formula mass (amu) of aluminum sulfate, an ionic compound with the formula Al2(SO4)3?

• 342.15

• 126.07

• 284.21

• 207.03

What is the fundamental constant known as Avogadro's number (NA)?

• 3.14159

• 6.022 x 10^23

• 2.718

• 9.81

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

• N2O

• NO2

• NO

• N2O5

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

• 0.250 mol/L

• 0.750 mol/L

• 1.000 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

• 0.16 M

• 0.06 M

• 0.10 M

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

• 15%

• 25%

• 37.5%

• 75%

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

• 36%

• 18%

• 72%

• 45%

What is the parts per million (ppm) concentration of a solute if there are 2 grams of the solute in 1 million grams of solution?

• 0.0002 ppm

• 0.2 ppm

• 0.002 ppm

• 0.02 ppm