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The mass spectrum of n-octane shows a prominent molecular ion peak (m/z 114). There is also a large peak of m/z of 57 but it is not the base peak.
a) Write fragmentation reactions that account for the base peak of 57 for both n-octane and 3,4-dimethylhexane.
b) Predict the intensities of the peaks at masses 57 and 114 in the spectrum of 2,2,3,3-tetramethylbutane. Support your answer with its corresponding fragmentation reaction.
An open flask contains .200 mol of air. Atmospheric pressure is 745 mm hg and room temperature is 68 degrees Fahrenheit. How many moles are present in the flask when the pressure is 1.10 ATM and the temperature is 33 degrees Celsius
can someone please show me how to draw 2-bromo-3,3-dimethyl-pentane according to Markovnikov's rule
The meniscus of mercury curves downward at the edges. Explain using the concepts of cohesion and adhesion.
A 0.9092-g sample of wheat flour was analyzed by the Kjeldahl procedure. The ammonia formed was distilled into 50.00mL of 0.05063 M HCl; a 7.46-mL back-titration with 0.04917 M NaOH was required. Calculate the percentage of protein in the flour.
The density of magnesium oxide is 3.58 g /cm3. Given that the radius of the O2- ion is about 140 pm in most oxides, calculate the radius of Mg2+, in pm. Your solution should include a sketch one face of the unit cell of MgO to show how the edge le..
Rb-87 decays with a half-life of 48.8 billion years to Sr-87. For short periods of time, there are so few decays that the number of changed nuclei is far smaller than the experimental error. The current limit on object ages therefore is 100,000,00..
What ratio of concentrations of the molecular base you chose in part a and its conjugate acid would be necesarry to achieve a pH of exactly 10.00?
The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy
Find the molarity of a Ca(OH)2 solution,given that 388 mL of it is neutralized in a titration by 117 mL of 0.0058 M HNO3.
Calculate the pH of a buffer composed of .50 M formic acid (HCO2H) and .70 M sodium formate (HCO2-Na+) before and after the addition of 10.0 ml of 1.0 M HCL
Draw the structures for each of the following fatty acids: a.) trans-5-Decenoic acid b.)cis-5-Decenoic acid
What should be the concentration of the NaCl solution (in g/L) so that it will have the same osmotic pressure as the blood at 37 deg C
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