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- 15. Kkura found a sulfide ore in the dungeon which she identified to be chalcocite. While waiting for her debut, she read from a journal that grinding and "roasting" (heated strongly with oxygen gas) chalcocite can generate copper (1) oxide, a pigment used to color ceramics. Find the amount of copper(I) oxide she can produce from 53 grams copper(I) sulfide. Cu2S(s) + O2(g) –> Cu2O(s) + SO2(g)Give the reaction type: CaCl2•3H2O (s) + ∆ ⟶ CaCl2 (s) + 3H2O (g)Silicon nitride (Si3N4) is a desirable ceramic material that withstands hightemperatures. Si3N4 can be produced by reacting silicon tetrachloride (SiCl4) withammonia (NH3). In addition to Si3N4, hydrogen chloride (HCl) is produced in thisreaction. There are no other reactants or products.(Molecular masses: Si3N4 = 140.31 g/mol, SiCl4 = 169.7 g/mol, NH3 = 17.03 g/mol)a. Please write a balanced equation for this reaction.______________________________________________b. If 128.0 g of SiCl4 is reacted with 10.2 g of NH3, which of these twocompounds is the limiting reactant for the production of Si3N4?_______________c. How much excess reagent (in grams) is left? ______________
- What is the molarity of a barium chloride solution prepared by dissolving 2.50 g of BaCl2-2H2O in enough water to make 400. mL of solution?A student decides to conduct an experiment by using two different flasks and two different gas samples. In flask 1, there exists Neon (Ne) gas, whereas the second flask is filled with nitrogen (N2) gas. If both flasks are kept at 1 K, answer the following questions. (Note: Molar mass of N2 = 28.014 g mol1, molar mass of Neon = 20.1797 g mol1, R=8.31 J. mol.K-1, k= 1.38 x 10-23 J.K-1, Avogadro's number = 6.02 x 1023 mo/-1 :) a) Find the average kinetic energy of one Neon molecule. 6.21e-21 b) Calculate the average kinetic energy (translational+rotational) of one nitrogen molecule by including rotational motion in your calculations. 1.035e-20 J c) Find the root-mean-square speed of one neon molecule. 35.14 VV ms-1What is the molarity of C12H22O11 in an aqueous solution that is prepared by dissolving a 21.67 g sample of impure C12H22O11 in water to make 500.0 mL of solution. Assume that the sample is 93.0% C12H22O11 by mass.
- A 241.3 gram sample of CoCl2 2H₂O is heated to dryness. Find the mass of anhydrous salt remaining. ●The metal has a molar mass of 206.77 gmol and crystallizes in a body centered lattice and has a density of 14.1 gcm3. The edge length of this cube is [word1] pm. (1 pm = 1 x 10-10 cm)Based on this. What is the theoretical percentage by mass of water in pure MgSO4•7H2O?