You have to use the density equation...
D = M / V
D= density
M= mass
V= volume
You have to find the volume of your water. Since you know your density the only thing left to find out is the mass. Just solve for it by multiplying the volume times the density.
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density= mass/volume 30g/7500cm3=.004g/cm3
if you want to calculate mass with volume density it is easy. there is this thing called the magic triangle. it goes mass over volume beside density mass=volume x density volume= mass/density density= mass/volume if you get that it is simple
You need to know density and percent by weight. Then use the following formula: ((1000)density x % by weight) / formula mass=concentration
Density is measured by mass per volume and the expressed formula is P=M/V where P represents Density, M represents Mass and V represents Volume. Specific density is a measurement of density relative to another substance and the expressed formula is Substance=P substance/ P reference. An example of specific density is measuring salt in ocean water and comparing it to salt in fresh water.
Compare its weight to the weight of an equal volume of water. The weight of the specimen divided by the weight of the water equals the density of the specimen.