Question 22 at a certain temperature this reaction follows first-order kinetics with a rate constant of 2.19. 2n2o5 --> 2n2o4 + o2. suppose a vessel contains at a concentration of . calculate the concentration of in the vessel seconds later. you may assume no other reaction is important.

The difference between atomic mass and molar mass

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.

Element before carbon on the periodic table