An endothermic reaction has: a. a negative DH, absorbs heat from the surroundings, and feels cold to the touch.
b. a positive DH, gives off heat to the surroundings, and feels warm to the touch.
c. a negative DH, gives off heat to the surroundings, and feels warm to the touch.
d. a positive DH, absorbs heat from the surroundings, and feels cold to the touch.
e. a positive DH, absorbs heat from the surroundings, and feels warm to the touch.

the answer is 303.15 or 303

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.

gas

explanation:

smoke is the matter of a gas