Can someone answer 2 for me please?

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2