CaSO4⋅2 H2O (s) can be heated to completely drive off water to form CaSO4 (s). A 2.49 g sample of CaSO4⋅2 H2O (s) is heated until the mass is constant. Calculate the mass of the solid that remains after the dehydration reaction is complete.

Write the balanced NET ionic equation for the reaction when aqueous BaCl₂ and aqueous (NH₄)₂SO₄ are mixed in solution to form aqueous NH₄Cl and solid BaSO₄.

The stock solution of bromine is prepared by dissolving 7.75 g of Br2 and 6.25 g of KBr in water and diluting to 25.00 mL in a volumetric flask. Calculate the molarity of Br2 in the stock solution. (KBr is present to facilitate the reaction.)

Iron ore is impure Fe2O3.  When solid Fe2O3 is heated with an excess of carbon, iron metal, and carbon monoxide are produced.  From a sample of ore weighing 878 kg, 515 kg of pure iron is obtained.  What is the % Fe2O3, by mass, in the ore sample?

What mass of Cu(IO3)2 can be formed from 0.650 g of CuSO4 · 5H2O? What mass of KIO3 is needed to convert the copper in 0.2750 g of CUSO4 - 5H2O to Cu(IO3)2?

Propenoic acid, C3H4O2, is a reactive organic liquid that is used in the manufacturing of plastics, coatings, and adhesives. An unlabeled container is thought to contain this liquid. A 0.338-g sample is combusted to produce 0.237 g of water and 0.517 g of carbon dioxide. Part A Calculate the theoretical mass % of C and H in propenoic acid. Express your answers, separated by commas, to three significant figures. % C=, % H= Submit Request Answer Part B ΑΣΦ 7 0 ? %,% Calculate the experimental mass % of C and H in the unknown liquid used in the experiment. Express your answers, separated by commas, to three significant figures. Ο ΑΣΦ % C=,% H= Submit Request Answer Part C Complete previous part(s) Provide Feedback ? %,%

9. NaI (aq)       +        Cl2 (g)      →       I2 (s)      +      NaCl (aq)               Balance the above equation first.  What mass of sodium iodide is required to produce 1.5 kg of iodine?

Consider the chemical reaction 4 K(s) + O2(g) ──> 2 K2O(s) The molar mass of K is 39.10g/mol, and that of O2 is 32.00g/mol. Without performing any calculations, pick the conditions under which potassium is the limiting reagent and explain your reasoning. 170g K, 31g O2 36g K, 2.5g O2 365kg K, 28kg O2 1.5g K, 0.38g O2

A 15.00g solid mixture containing Ca(OH)2, among other non-basic components, was neutralized with 0.2000g of HCl. What was the mass percentage of Ca(OH)2 in the mixture? Round your answer to four significant figures.