If an object placed in water sinks - then it has a density greater than water.
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You are trying to convert a unit of volume to a unit of weight. In order to determine the answer you would need to know the density of the object being measured. For example the density of water is approx. 1000 kg/m³
To determine the mass of a copper object, you need to know its volume as well as the density of copper, which is 8.9 g/cm^3. The formula to calculate mass is mass = density x volume. So, if you have the volume of the copper object, you can multiply it by the density of copper to find its mass.
Density of water is 1000kg/m3. Also, Volume = Mass/Density = 1/1000 = 0.001m3. So, volume of water that has mass of 1 kg is 0.001m3.
With water it's easy. 1 cm3 of pure water equals 1 gram. With everything else, you need to know the density. Then use the formula density = mass / volume. Re-write the formula as mass = density x volume. The unit of density is g/cm3 - so you need not convert the units.
You need to know the density of the chlorine which is affected by the temperature and pressure at which the chlorine is. Once you know the density, you can convert it using: density = mass/volume → volume = mass/density. You'll need to know the density in pounds per gallon.