A polyamide was prepared by bulk polymerization of hexamethyl diamine (9.22 g and molecular weight 116) and adipic acid (13.2 g and molecular weight ...  

Examination of the Fischer esterification mechanism continues. Overall reaction (ungraded): involved MeOH addition to form the key tetrahedral intermediate. Part 2 involves loss of H2O from the tetrahedral intermediate to form the ester. Intermediate species (from Part 1): Add two curved arrows for the next step. For all remaining steps in the mechanism: Draw each species (organic and inorganic) resulting from the previous step. Each step will include all of, and only, the atoms given in the first step (i.e., do not use extra reagent molecules/ions, and do not omit spectator ions). Include charges and nonbonding electrons. Add curved arrows for the forward reaction. Note: proton transfers must be drawn out explicitly. Show no more than one H+ transfer in any one step; all H+ transfers are intermolecular. (Depending on how you drew the mechanism, the drawing area below might not be needed. Do not draw the final products.)

If one H2O molecule contains 2 hydrogen atoms and 1 oxygen atom, and 10 H2O molecules contain 20 hydrogen atoms and 10 oxygen atoms, how many hydrogen atoms and oxygen atoms are contained in 6.02 times 1023 H2O molecules? The star named Alpha Centauri is 4.3 light-years from the Earth. If 1 light-year is approximately 6 times 109mi, how far is Alpha Centauri? If the county of Queens, New York, has a population of approximately 2,200,000 and the area is 110 mi2, how many people are there per square mile? If the county of Catawba, North Carolina, has a population of approximately 150,000 and the area is 400 mi2, how many people are there per square mile? According to the Federal Emergency Management Agency (FEMA), the annual loss due to earthquakes in California is approximately $3.5 times 109. If this is representative as a yearly average, find the loss over 15 yr.