Selenium (Se) has 30 protons and 20 neutrons in each atom, therefore its atomic number is
and its atomic mass number is
30,20
30, 50
10, 50
10, 30

When the pressure that a gas exerts

Which metal exist in liquid state and can be cut with knife ?

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.