If you started with 880 kilograms of radioactive pennies, how many would be non-radioactive after 20 seconds of decay? show how many half live would pass before all 880 kilograms had decayed? explain & show work.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

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.

the maximum mass of nh3 is nh3 in grams