1. A sample of oxygen gas has a volume of 150 mL when its pressure is 0.947 atm at 300K. What will the volume of the gas be at a pressure of 1500 atm and standard temperature (C or 273K )? Show all work

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.