calculate the amount of solute that separates solution prepared at 50 degree celsius is cool down to 30 degree Celsius the solubility of the given solute is 35 at 50 degree Celsius and 21 at 30 degree Celsius

The answer is d.potassium

It will appear as o2(g) as a reactant 

Those are different gas lawshere is a brief description of themcharles's law states that volume and temperature are directly proportional to each other as long as pressure is held constant.  boyle's law asserts that pressure and volume are inversely proportional to each other at fixed temperature.gay-lussac's law introduces a direct proportionality between temperature and pressure as long as it is at a constant volume.    source: