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- Two general chemistry students working together in the lab weigh out 0.832 g of CaCl2 2 H2O into a crucible. After heating the sample for a short time and allowing the crucible to cool, the students determine that the sample has a mass of 0.739 g. They then do a quick calculation. On the basis of this calculation, what should they do next? (a) Congratulate themselves on a job well done. (b) Assume the bottle of CaCl2 2 H2O was mislabeled; it actually contained something different. (c) Heat the crucible again, and then reweigh it.What is the molar mass of oxygen (O2)? A. 1.204x1024 g/mol B.6.02x1023 g/mol C.15.9994 g/mol D. 31.9988 g/mol 2. Answer the question below. Use the rubric in the materials for help if needed. What is the molar mass of Ca3(PO4)2?Show all your work. 3. How many atoms of sodium do you have if you have one mole of sodium? A. 1 atom of sodium B. 6.02x1023 of sodium C. 6 atoms of sodium D. 6.02x1032 atoms of sodiumHow many grams of N2 are needed to make 444 g of NBr3 ? N2 + 3 Br2 → 2 NBr3 + 44.0 kJ The molar mass of NBr3 is 253.719 g and the molar mass of N2 is 28.013 g Blank 1. Fill in the blank, read surrounding text. mol NBr3 (444 g NBr3)(–––––––––––––––––––––––––) = Blank 2. Fill in the blank, read surrounding text. mol NBr3 Blank 3. Fill in the blank, read surrounding text. g NBr3 Blank 4. Fill in the blank, read surrounding text. mol N2 Blank 5. Fill in the blank, read surrounding text. mol NBr3 (–––––––––––––––––––––––––) = Blank 6. Fill in the blank, read surrounding text. mol N2 Blank 7. Fill in the blank, read surrounding text. mol…
- The hydrated salt, MY3.XH2O, was heated strongly in a crucible to remove all the water molecules of crystallization. The data for this experiment are given in the table below. Mass of empty crucible and cover 28.86 g Mass of crucible, cover, and hydrated salt 32.86 g Mass of crucible, cover, and anhydrous salt 31.24 g Molar mass of anhydrous salt 238.03 g/mol (i) Calculate the % composition by mass of water in the hydrated salt. (ii) Determine the value of x. (iii) M is in Period 4 of the Periodic Table of the Elements. If Y = NO3-, identify the element M. (iv) What is the name of this hydrated salt?A sample of trifluoroacetic acid, C2HF3O2, contains 60.9 g of oxygen. Calculate the mass of the trifluoroacetic acid sample. mass : * TOOLSDetermine the quantity (g) of pure CaCl2 in 7.5 g of CaCl2•9H2O. Show your work.
- In the combustion of butanol (CH 00), what mass (in g) of butanol must react to produce 55.4 g of product? N.B. Combustion is the reaction of a substance with molecular oxygen (O2) to produce water and carbon dioxide.Many solids used in the lab come with different variations for different purposes. For example, EDTA has a formula of C1oH16N2O8 (292.2438 g/mol) but to improve the solubility of EDTA in water, the one we used in the lab is EDTA disodium salt dihydrate "C10H14N2N22O8 •2H20 " (Molar mass: 372.24 g/mol)where there are two sodium atom and two water molecule attached to the EDTA, therefore, when calculating the molar mass of EDTA, we need to add the mass of two sodium atoms and two water molecule mass. Calculate the molar mass of Iron(III) chloride hexahydrate: FeCl3• 6H20. O 162.29 g/mol 180.29 g/mol 270.29 g/mol O 17527 g/molCalculate the number of moles in a 7.89 kg sample of aspirin.
- A major component of honey is fructose (C6H12O6) with a molar mass of 180.16 g/mol. A tablespoon (15.0 mL) of honey is considered one serving. How many tablespoons must be eaten to consume 0.1900 moles of fructose? Assume honey is 100% fructose. The density of honey is 1.45 g/mL.60. Lithium and bromine combine to form lithium bromide. as shown here. If 30 moles of Li react with bromine in this way, how many moles of Br, are consumed? How many moles of LiBr are produced? 2 Li (s) + Br, (I) →2 LİBR (s)Quartz, SiO2, contains 46.7% silicon. What mass of silicon is present in 370 g of quartz?
