The density of water at 20 °C is 0.9982 g/cm^{3} or 998.2 g/L. The volume of water is 0.127 L thus, its mass can be calculated from the following formula:
d=\frac{m}{V}
Here, d is density, m is mass and V is volume of water.
On rearranging,
m=d×V=(998.2 g/L)(0.127 L)=126.7 g
Thus, mass of water is 126.7 g.
Taking into account the definition of density, 127.619 grams of water are contained in a 0.127 L sample at 20°C.
In first place, you have to know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. That is, density is a quantity referred to the amount of mass in a given volume of a substance or an object.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this case, you know:
Replacing in the definition of density:
[tex]997\frac{g}{mL} =\frac{mass}{127 mL}[/tex]
Solving:
mass= 0.997 [tex]\frac{g}{mL}[/tex]× 127 mL
mass= 126.619 grams
Finally, 127.619 grams of water are contained in a 0.127 L sample at 20°C.
Learn more about density:
