In 1885, Johann Balmer, a numerologist, derived the following relation for the wavelength of lines in the visible
spectrum of hydrogen:
Wavelength = 364.6 n²/(n^2 - 4)
where wavelength is in nanometers and n is an integer that can be
3, 4, 5, Show that this relation follows from the Bohr
equation and Equation 5.2. Note that, for the Balmer series, the electron is returning to the n = 2 level.

A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.

Light waves can move through , but they travel fastest when they move through a(n) .

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.