Bromine is one of only two elements that is a liquid at room temperature. bromine has a heat of vaporization of 30.91 kj/mol and its boiling point is 59 °c. what is the entropy of vaporization for bromine?
a. -301 j/(mol∙k)
b. -93.1 j/(mol∙k)
c. 10.7 j/(mol∙k)
d. 93.1 j/(mol∙k)

Stage in which a typical star has completely stopped fusion

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.

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?