What volume, in milliliters, of calcium chloride 15.0 M stock solution would you use to make 500 mL of 0.300M of calcium chloride solution?
20
5
15
10

The volume of stock solution of calcium chloride required is 10 mL.

Explanation:

A solution consists of solute and solvent. A solute is defined as the component that is present in a smaller proportion while the solvent is defined as the component that is present in a larger proportion.

To calculate the amount of solute needed, the formula used is:

            ....(1)

where,

are the concentration and volume of stock solution of calcium chloride

are the concentration and volume of diluted solution of calcium chloride

Given values:

Plugging values in equation 1:

Hence, the volume of stock solution of calcium chloride required is 10 mL.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

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.