Deandra notices that most of the atomic masses on the periodic table are not whole numbers. She wonders: "Why do many atomic masses have decimals?"
Which of the following would be the best answer to her question?
A the atomic mass includes the mass of the electrons
B. the atomic mass measures the relative abundance of the ions
C. the mass of neutrons can vary
D. the atomic mass is a weighted average of the isotopes

What is a metal replacement reaction

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.

Which type of fossil does this image depict?