At room temperature, all samples of liquid water must have the same 1.mass 2.density 3.volume 4.weight

The answer is 2. density

At room temperature, all samples of liquid water must have the same density.

Whatever the volume of different liquid water samples, they always have same density. As density of liquid water is always same that is 1 g cm⁻³. So different liquid water can have different volume, weight and mass but their density always remains same.

answer: at room temperature (roughly 20 degrees c), you can dissolve 203.9 grams (or 200 grams) of sugar in 100 ml of water. as water temperature increases, the amount of sugar that will dissolve increases, up to about 500 grams of sugar in 100 ml water at 100 degrees c.

explanation: