A closed container contains a gas mixture of No, Ne, and He, which has a total pressure of 28. 7 atm. If the partial pressures of Ne and He are 6. 20 and 2. 30 atm, respectively, What is the mole fraction of N»?.

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

What causes most sediment to wash or fall into a river

An atomic nucleus is composed ofa)protons.b)protons and neutrons.c)protons and electrons.d)protons, neutrons, and electrons.