If you perform a 4-point 1:2 dilution of a 0.5M stock solution, what will be the final concentration? If you perform a 2-point 1:4 dilution of a 0.5M stock solution, what will be the final concentration?
If you perform a 2-point 1:16 dilution with a 1M stock solution, what will be the final concentration? What are the volumes of the stock and diluent used in each step if the final volume is 500mL?
Using the final solution from #3, if you perform a 4-point 1:4 dilution with a final volume of 100mL, what will be the final concentration?

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

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.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.