A100.0 ml graduated cylinder is half-filled with 8.0 g of diatomaceous earth, a material consisting mostly of silica and used as a filtering medium in swimming pools. how many millilitres of water are required to fill the cylinder to the 100.0 ml mark? the diatomaceous earth is insoluble in water and has a density of 2.2 g/cm3.

96.3636 mL

Explanation:

Given;

Volume of the graduated cylinder = 100.0 mL

Mass of the diatomaceous earth in the cylinder = 8.0 g

Density of diatomaceous earth = 2.2 g/cm³

Therefore,

the volume of diatomaceous earth in  the cylinder =

or

the volume of diatomaceous earth in  the cylinder =

or

the volume of diatomaceous earth in  the cylinder = 3.6363 cm³

also,

1 cm³ = 1 mL

Thus,

the volume of diatomaceous earth in  the cylinder = 3.6363 mL

Hence,

The Volume of water required to fill the cylinder upto 100 mL = 100 - 3.6363

= 96.3636 mL

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.