John is testing the effect of temperature on the solubility of sugar in water. He plans to determine the mass of sugar dissolved in a saturated solution. He will begin with a known mass of sugar and add sugar to water until the solution is saturated. He will then calculate how much sugar dissolved by subtracting the remaining mass from the initial mass, He organized data about his experiment in the following table: Group A Group B Group C Volume of water 100 mLN Temperature 25°C 1000 g Initial mass of sugar 800 g Final mass of sugar Which factor should be the same in all three groups?​