Biodegradable bags are made of polymers and what other substance?

Need on both questionswill markbr />

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.