Need Help ASAP Please! The Answer Needs To Be Numerical A student ran the following reaction in the laboratory at 546 K:

COCl2 (g) CO (g) + Cl2 (g)

When she introduced 0.723 moles of COCl2 (g) into a 1.00 liter container, she found the equilibrium concentration of Cl2 (g) to be 3.38×10-2 M.

Calculate the equilibrium constant, Kc, she obtained for this reaction.

Kc =

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

The excretory system,need answers for all: )