8 Observe figure 11: calculate: a - The mass of water. b- The volume of oil. -The mass of oil. d- The relative density of oil. 20 50 20 water oil 40 20 Fig. 11.

Assume that the mass of impure acetanilide is 1.748 g. and the mass of recrystallized acetanilide is 1.272 g.  Calculate the percent recovery.  Calculate your answer to 2 decimal places.  Remember the units!

a. Convert 52.6 mM (millimolar) to μM (micromolar) and to M (molar). b. Convert 200.0 μM to mM (millimolar) and to M (molar). c. The new U.S. Public Health Service optimal fluoride concentration in water is 0.700 mg/L. Convert this value to M (molar) and to ppm. Upload your responses here.

Part A. State a number of molecules for 1 mol of nitrogen, N2.  Part B. State a mass for 1 mol of nitrogen, N2. Express your answer to two decimal places and include the appropriate units. Part C State the volume at STP for 1 mol of nitrogen, N2. Express your answer to three significant figures and include the appropriate units