Hydrogen flows into a fuel cell at a rate of 27 gmol/min. Air enters the fuel cell in a separate stream. The air stream flow rate ensures that oxygen is fed at 75% excess required for the stoichiometric reaction. All hydrogen is reacted. Assume that a single stream leaves the fuel cell. Calculate the mole fraction of oxygen in the outlet stream.

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.