Muscles produce lactic acid when insufficient oxygen is available and is responsible for muscle cramps during vigorous exercising. It also provides the acidity found in dairy products. Chemical analysis shows that lactic acid is 39.99% carbon, 6.73% hydrogen, and 53.28% oxygen by mass. A 0.3338 g sample of lactic acid was vapourized in a sealed 300 cm³ container at 150 °C, producing a pressure of 326 torr. Determine the molecular formula of lactic acid from the data given.

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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

explanation: