How many grams of Krypton gas will exert a pressure of 5.43 atm in a 5.80-liter container at 25°C? Please show work :)

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

Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?