What do i do. Im just completely lost with this question and its today please help thank you all for your time.

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

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.