How many atoms are in 4 moles of oxygen?

Explanation for basic character?

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?