5. if an element has 12 protons and 17 neutrons, how many electrons must it have?

How have the greenhouse gasses increased from the year 2000 to 2018

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.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.