Which of the following statements is /are correct? 1. A calorie of heat is the energy required to change 1.00 g of water from 14.5 C to 15.5 C 2. One calorie (cal ) equals 4.184J where the joule () is the Sl unit of energy 3. A calorie ( cal) is equal to 1000 dietary calories (C) .

A CALORIE OF HEAT IS THE ENERGY REQUIRED TO CHANGE 1.00 G OF WATER FROM 14.5 °C TO 15.5 °C

ONE CALORIE EQUALS 4.184 J WHERE THE JOULE IS THE SI UNIT OF ENERGY

Explanation:

A calorie is a unit of measurement and in general is the amount of heat required to raise one gram of a air-free water by one degree Celsius. The calorie has been used in time past and still in use especially in nutrition as regards gaining or losing weight. Calorie can be small calorie or large calorie.

A small calorie is the amount of heat required to raise the temperature of one gram of water by one degree Celsius.

A large calorie is the amount of heat needed to raise the temperature of one kilogram of water by one degree Celsius.

In other words, a large calorie is 1000 small calorie.

Calorie is regarded obsolete since the adoption of Joule as the standard unit of energy or heat. So therefore, calorie is still in use and it is the amount of heat required to raise the temperature of one gram of water by one degree and it is also equivalent to 4.184 J, the most used SI unit of energy. The above two statements are correct about calorie.

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.

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