We need to know the two gas laws that form the combined gas law
The combined gas laws is derived from the Boyle's gas law and Charles's law.
According to Boyle's law;
P₁V₁ = P₂V₂
On the other hard, according to Charles's law;
V₁/T₁= V₂/T₂
The combine gas laws combines both Boyle's law and Charles's law.
According to the combined gas law, the volume of a fixed mass of a gas i inversely proportional to pressure and directly proportional to its absolute temperature.
Therefore, combining both Boyle's law and Charles's law, we get;
The basic SI unit for volume is the cubic meter (m3), but smaller volumes may be measured in cm3, and liquids may be measured in liters (L) or milliliters (mL).
Explanation: The barium will give some of it's electrons up to the oxygen, and then they will both reach the stability of a noble gas. Then, they will both combinate to barium oxide, so the answer is barium oxide.
