A solution has a concentration of 40 g. L-1 . We take 20 mL of this solution and add water. The

final volume is 40 mL. What's the new concentration? No calculations but you need to

justify​

The new concentration is 20 g/L

Explanation:

According to the dilution law,

where,

= concentration of stock solution = 40 g/L

= volume of stock solution = 20 ml = 0.02 L

= concentration of diluted solution= ?

= volume of diluted solution= 40 ml = 0.04 L  

Thus new concentration is 20 g/L

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.