he Freons are a class of compounds containing carbon, chlorine, and fluorine. While they have many valuable uses, they have been shown to be responsible for depletion of the ozone in the upper atmosphere. In 1991, two replacement compounds for Freons went into production: HFC-134a () and HCFC-124 (). Calculate the molar masses of these two compounds. (Round your answer to two decimal places.) HFC-134a: g/mol HCFC-124: g/mol

Coal is a leading source of energy for the world. While coal is primarily composed of carbon and hydrogen, a small amount of sulfur is also present. This leads to the production of pollutants such as sulfur dioxide (SO2) through the following reaction: S(s)+O2(g)→SO2(g) A sample of coal was found to contain 1.35% sulfur by mass. If 1,250 kg of this coal were burned, what mass of sulfur dioxide could theoretically be formed (in kg)?

Willa weighs a clean, dry, empty crucible and finds it to have a mass of 95.83 g. After putting a spoonful of an unknown hydrate into it, she finds that the mass has increased slightly to 99.87 g. She heats the crucible and its contents, and finds that the mass has dropped to 97.22 g. Willa is told by her teacher that the molar mass of the anhydrous salt is 75.65 g.

Consider the following chemical reaction. 3 Zn(C₂H₃O₂)₂(aq) + 2 Na₃PO₄(aq) → 6 NaC₂H₃O₂(aq) + Zn₃(PO₄)₂(s) The chemical formula of zinc phosphate is Zn₃(PO₄)₂. What is the formula weight of zinc phosphate? Provide an answer to two decimal places.