What is the mass of chlorine in 3.9 x 1019 molecules of Cl2?

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under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

i think its 100

i hope this !