5. According to the mechanism given in the textbook, the FIRST STEP in the reaction of the phosphorus ylide with a carbonyl compound such as cinnamaldehyde involves (single answer only): a. a proton transfer b. formation of a four-membered ring c. a nucleophilic attack on an sp? carbon d. an acid-base reaction e. an Sn2 displacement

Blood alcohol content is a measure of alcohol in the blood as a percentage. It is calculated in grams per 100 mL of blood, so a BAC of 0.08 means your blood is 0.08% alcohol by volume. what is the total mass of alcohol (in grams) that is present for the same adult male whose total blood volume is 5.6L?

A chemistry student weighs out 0.117 g of hypobromous acid (HBrO) into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1600 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Be sure your answer has the correct number of significant digits. mL 0 x10 X

4. Gasoline can be reasonably approximated as C9H20 with a density of 0.718 g/mL. Diesel can be reasonable approximated as C14H30 with a density of 0.763 g/mL. (Both gasoline and diesel are complicated mixtures. These formulas are something like weighted averages of the formulas of the different components, where the weighting is based on various quantifiable behaviors. That is, using these artificial formulas for gasoline and diesel allows one to calculate average properties that match what petroleum engineers might measure.) The enthalpy change from burning one mole of gasoline is -6160 kJ. The enthalpy change from burning one mole of diesel is -7940 kJ. Determine which fuel generates the biggest enthalpy change per gram burned, and which generates the biggest enthalpy change per mL burned.

You have a 11.5 mg sample of blood that contains various proteins. Hemoglobin is the only protein in the sample containing Fe. Hemoglobin contains 3.83% by mass of a compound called heme (C₃₄H₃₂FeN₄O₄, MW = 616.49 g/mol). You find that your 11.5 mg blood sample contains 34.9 micrograms of Fe. What is the mass percent of hemoglobin in your protein sample?   -don't prematureley round

Drag conversion units onto the boxes in the equation to make conversions. Some boxes can be left empty. Click on a unit to remove it from its position. 1 cm³ Cu 210 L X 1 kg 1L Submit 9 g Cu = 1000 g 1000 cm³ Next m 3 9,5 × 1021 atoms Cu A piece of copper has a volume 210 L. What is the mass of the sample, in units of kilograms? In the boxes above, enter the correct setup that would be used to solve this problem. < (2 of 3) Hide Hint - 1 g Cu 1 cm³= 1 mL.

The world population is estimated to be 7.4 x 109. Nauru is the smallest island nation and comprises 1.5 x 10-4% of the world population. If the percentage of left-handed people is approximately 12%, estimate the number of left-handers on the island of Nauru.

To aid in the prevention of tooth decay, it is recommended that drinking water contain 0.900 ppm fluoride, F−. How many grams of F− must be added to a cylindrical water reservoir having a diameter of 4.12×10^2 m and a depth of 76.72 m?

A chemist prepares a solution of silver(I) perchlorate (AgClO) by measuring out 4.4 x 10 umol of silver(I) perchlorate into a 150. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's silver(I) perchlorate solution, Be sure your answer has the correct number of significant digits. mmol 回 国