A 31.78 gram sample of cobalt is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 44.72
g. Determine the empirical formula of the metal oxide.

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.

If a gas has an initial pressure of 101kpa and a volume of 10l, then it expands to a volume of 20l, what is the new pressure?