Which is the number placed in front of an element’s symbol in a chemical formula?

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.