Pb(CH3COO)2 + H2S --> PbS + CH3COOH

1. How many moles are produced of PbS when 5.00 grams of Pb(CH3COO)2 is reacted with H2S? Make sure to show your work to get full credit.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

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.

Describe the process that was used in this lab to create magnesium oxide, specifically identifying the type of chemical reaction. explain why the product had a higher mass than the reactant, and how this relates to conservation of matter.