Please help me ASAP What is the main difference between the reaction in a hydrogen-oxygen fuel cell and the burning of hydrogen in the air?

A. When hydrogen burns in air, the oxidation and reduction reactions are separated.

B. The burning of hydrogen in air does not produce water.

C. The reaction in a fuel cell does not produce water.

D. The reaction in a fuel cell is very controlled.

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.