8. What is the mass of copper in a sample of copper(I) chloride weighing 6.93 g ?*

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

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.