One million molecules of water seems like a lot. But one mole of water contains 6.022 E 23 molecules of water, so one million molecules is only 1.66 E(-18) moles of water. This means that the volume is 2.99 E(-20) liters and has a mass of 0.299 femtograms.
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The volume of 1000 grams of water is approximately 1 liter, as 1 gram of water is equivalent to 1 milliliter of water.
The simple answer is "about 1 liter". Need to know the temperature. Density of water varies from just under 1g/cc at 4C to .95 near boiling. Close enough?
mass = volume * density Grams are a measure of mass. Liters are a measure of volume. You can use the internet to look up the density for the gas to which you are referring. For instance, hydrogen's density is .0000899 g/cm^3 (grams per cubic centimeters). One liter is 1000 cm^3. 1000 cm^3 * .0000899 g/cm^3 = 0.0899 g Therefore a liter of hydrogen contains about 0.09 grams of hydrogen.
The mass of 1000 cm^3 of seawater can be calculated by multiplying its density (1.04 g/cm^3) with the volume (1000 cm^3). Mass = Density x Volume Mass = 1.04 g/cm^3 x 1000 cm^3 Mass = 1040 grams Therefore, the mass of 1000 cm^3 of seawater is 1040 grams.
1 liter of water has a mass of 1000 grams. This is because the density of water is 1 gram per milliliter.
The density of water is approximately 1 gram per milliliter. Since there are 1000 milliliters in a liter, 12 liters of water would be equivalent to 12,000 grams.
The density of a substance will determine the mass of 1 liter. Water has a density of 1 g/ml, so 1 liter of water weighs 1000 grams. Other substances will have different densities and therefore different masses for 1 liter.