The amount of sugar that can be dissolved in a jar of ml with room temperature depends on the volume of the jar and the temperature of the room. The solubility of sugar in water increases as the temperature increases. At room temperature (around 25°C), about 200g of sugar can be dissolved in 100ml of water. This is the saturation point for sugar in water at room temperature. Beyond this point, the sugar will not dissolve but will settle at the bottom of the jar.