A radioactive nucleus Pb-208 undergoes an alpha decay. (a) w…

A radioactive nucleus Pb-208 undergoes an alpha decay. (a) write the complete nuclear reaction (b) if 420g of Pb-208 is initially present, how much will be left after 3 half-lives? (c) what is the mass percentage remaining after the 3 half-lives? Show work for full credit.

A gas at a temperature of 298 K has a pressure of 0.987 atm….

A gas at a temperature of 298 K has a pressure of 0.987 atm.  What will the pressure be at a temperature of 325 K, assuming no change in volume? (Show details of work for full credit, including writing the formula needed, defining your parameters, and solving for the unknown)