For a solution to be formed, the green powder would need to dissolve in the water to form a homogenous mixture. But since the water was cloudy and had lumps of the green powder, it means that the powder did not dissolve, but instead remained insoluble.
where p is the pressure, v is the volume, n is the number of mole (which can be equal to mass /mr), T is the temperature in kelvin, and r is (molar constant) = 8.31 (units)
