Certain byproduct in nuclear reactors, 210po, decays to become 206pb. after a time period of about 276 days, only about 25% of an original sample of 210po remains. the remainder has decayed to 206pb. determine the approximate half-life of 210po.

A certain byproduct in nuclear reactors, 210Po, decays to become 206Pb. After a time period of about 276 days, only about 25% of an original sample of 210Po remains. The remainder has decayed to 206Pb.  

Determine the approximate half-life of 210Po.

A) 138 days

its first and third is your answer i did the qustion the fourth isnt right

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.