Why is a solvent necessary even if it does not remove the actual stain?

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates

How many moles of oxygen gas are produced from the decomposition of six moles of potassium