El volumen del aire en los pulmones de una persona es de 615 ml aproximadamente, a una presión de 760 mm Hg. La inhalación ocurre cuando la presión de los pulmones desciende a 752 mm Hg. ¿A qué volumen se expanden los pulmones?

The volume of air in a person's lungs is about 615 ml, at a pressure of 760 mm Hg. Inhalation occurs when the pressure in the lungs drops to 752 mm Hg. To what volume do the lungs expand?

621.54mL

Explanation:

Given parameters:

Initial volume  = 615mL

Initial pressure  = 760mmHg

Final pressure  = 752mmHg

Unknown:

Final volume = ?

Solution:

To solve this problem we apply Boyle's law.

 Boyle's law states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

  Mathematically;

    P₁V₁  = P₂V₂

P and V are pressure and volume values

1 and 2 are initial and final states;

      760 x 615  = 752 x V₂

           V₂  = 621.54mL

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

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.