Calculate the energy released when isotope of carbon, 146c , decays by β− emission. the atomic mass of 146c is 14.003242 u , the atomic mass of 147n is 14.003074 u . assume that the neutrino has no mass.

Atmospheric pressure is 1.00 atm, but air is only composed of 21.0% (by moles) oxygen. thus, the partial pressure of oxygen in air is less than 1.00 atm. what is the millimolar concentration of dissolved oxygen for a lake or stream under the partial pressure of oxygen and a temperature of 20 ∘c?