4. How many moles are in 9.12 x 1023 molecules of sugar? And I want the steps to so that I can understand better

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

When balancing a chemical equation:

Which element would mostly likely have an electron affinity measuring closest to zero