A) one kmol of n2o4 dissociates at 25℃, 1 atm to form an equilibrium ideal gas mixture of n2o4 and no2 in which the amount of n2o4 present is 0.8154 kmol. determine the amount of n2o4 that would be present in an equilibrium mixture at 25℃, 0.5 atm.

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

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

All of the following are part of the biosphere except