How did mendeleev's work on the periodic table contribute to the discovery of elements?

In which direction will the following reaction go if the standard reduction potentials are 0.80 v for ag/ag+ and –0.44 v for fe/fe2+? ag+ + fe → ag + fe2+ a.)forward b.)the reaction cannot occur. c.) not enough information is given. d.) reverse

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?