What is the volume of 18.02 grams of water?

Answer 1

The density of water at 4 °C is exactly 1 g per milliliter (1 g = 1 mL), or equivalently 1 kg per liter (1 kg = 1 L). However, the density is temperature dependent, and so this is not exactly true at all temperatures (but pretty close).

So at 4 °C, 18.016 g is exactly 18.016 mL, 0.018016 L.

At other temperatures this will be slightly different. Under the Web Links to the left of this answer is a link to a website that has an automatic calculator to find the density of water at any temperature. Just type in the temperature and it gives you the density. Then just divide the mass by the density to get the volume. (Note that the site also has an entry for the salinity of the water -- if you want pure water, make sure to set the salinity to 0).

Note that 18.016 grams is the exact weight of 1 mole of water, but that is really pretty much irrelevant to determining the volume, unless you happen to know the molar volume of water. The density, in grams per mL is much more commonly known that the molar volume.

Answer 2

To be able to answer how many grams are in that many liters one would have to know the substance being measured in order to find the density. If you find the density of the substance (which should be measured in grams/liter) then you can just multiply that by 18.75.

Answer 3

The density of standard water at standard temperature and standard pressure

is supposed to be 1 kilogram/liter = 1 gram/milliliter.

So, if that's the substance that you're handling and the environment in which

you're working, then 18.02 grams of it occupy 18.02 milliliters of volume.