50% by mass of a 2.2 moles mixture of He and Ar gasses .
Calculate the mole number of He
in the mixture?

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

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate