What mass of helium in grams is required to fill is15 L balloon to pressure of 1.0atm at 25°c?​

What is the equilibrium constant of aa+bb=cc+dd

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.

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize