Hỗn hợp khí X gồm C2H4, C2H2, C3H8, C4H10 và H2. Dẫn 6,32 gam X qua bình đựng dung dịch brom dư thì có 0,12 mol Br2 phản ứng. Đốt cháy hoàn toàn 0,1 mol khí X, thu được 4,928 lít CO2 (ở đktc) và m gam H2O. Giá trị của m là

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.