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Question: Present-day x-ray analysis of silicon (the element from which modern electronic devices are constructed) shows that atoms in the solid state of Si are arranged as shown in Fig. The cubic box shown contains 8 Si atoms, and its side length is 543.1 pm. (1 pm = 10-12 m)
a. What is the volume of the box in m3?
b. The measured density of Si is 2330 kg/m3. Calculate the mass of a single Si atom.
c. The atomic weight of Si is 28.086 g (=? in kg). From this and your answers to (a) and (b), find Avogadro's number NA. (This is presently the most accurate way known to find NA.)
Fig. - Arrangement of Si atoms in a crystal of silicon
Do some research on the internet and determine the status of industrial hygiene and occupational safety and health prior to about 1900. Describe atomic absorption spectroscopy and gas chromatograph mass spectrometry and what they are used for?
The mass spectrum of an organic compound shows the relative abundances of M to be 46.08% and M 1 to be 1.495%. Assuming the peaks are caused by 12C and 13C isotopes, determine the number of carbon atoms in the compound. Natural abundances
A bicycle tire is filled with air to a pressure of 610kPa, at a temperature of 60.5oF. Riding on asphalt on a hot day increases the temperature of the tire to 58.0oC. The volume of the tire increases by 4.0%. What is the new pressure in the tire
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A sample of an unknown peptide undergoes a single round of Edman degradation, which liberates ATZ-Gly. Another sample of the peptide is treated with trypsin, and a third sample is treated with chymotrypsin. The table below shows the fragments.
You are provided with a restriction enzyme called EcoR1. Using this enzyme design an experiment to demonstrate how this enzyme can be used in recombinant DNA technology to produce a clone.Report your lab work using the same format that you have been ..
Problem- Use the thermodynamic data in Appendix B to calculate the standard cell potential and the equilibrium constant at 25°C for the cell reaction in a direct methanol fuel cell
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