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- Discuss the following general steps in gravimetric analysis. Sample solution Preparation Precipitation Digestion Filtration and Washing Drying and igniting Weighing and then calculation.Calculate the number of atoms of carbon (C) in 475 cm3 of the colorless gas butane at 0 °C and atmospheric pressure, where its density is 2.59×10-3 g cm-3. The molecular formula of butane is C4H10.Using PCl3(g) as an example, show with dimensional analysis that the molecular mass and molar mass of a substance are numerically equal but have different units.
- 2.) Five standardized dilutions of aqueous lead(11) chromate solution were prepared by adding a volume of 0.0010 M PbCrO4(ag) from a buret and then diluting the solution with deionized water to a total volume of 100.0 mL. Use the provided information to determine [CrO42] in each. Hint: enter the decimal before the scientific notation. Mixture Initial Buret Reading (mL) Final Buret Reading (mL) [Cro,?] (M) 3 2.00 7.10 ? x 105A student had a sample of CaCl2 • nH2O. He heated the sample until the mass did not change. From this data, calculate (a). the percentage of CaCl2 in the original sample and (b). the formula of the hydrate Mass of crucible + cover = 28.39 gMass of crucible + cover + sample = 30.41 gMass of crucible + cover + residue = 29.75alculate (to the nearest 0.1 u) the formula mass of these compounds. (a) rubidium nitrate, RbNO3 u(b) carbon tetrachloride, CCl4 u(c) boron trifluoride, BF3 u Calculate (to the nearest 0.1 u) the formula mass of these compounds. (a) azithromycin, C38H72N2O12 u(b) saccharin, C7H5NO3S u(c) glucose, C6H12O6 u
- 2. The solubility of aspirin in water is 1 g per 300 mL at 25 °C. Assuming that your crystallization and washing with water were done at this temperature, what weight of aspirin did you lose in the filtrate and washings? How much was your percent yield lowered by this loss?(a) Using NO2(g) as an example, show with dimensional analysis that the molecular mass and molar mass of a substance are numerically equal but have different units.(b) The number of atoms of oxygen in a 0.01800-g sample of O3(g) is equal to the number of molecules in a 0.06085-g sample of CxH6. Determine the value of x. (c) Vitamin C contains carbon, hydrogen and oxygen only. It is 4.579% by mass of hydrogen. One molecule of vitamin C contains 6 oxygen atoms and 8 hydrogen atoms.Determine the molecular formula of vitamin C.Please can you complete answer for b an c
- 2. Balance the following equations by supplying the lowest whole numbers for w, x, y, and z: (a) w S8 + x Cl₂ → y S₂Cl₂ (b) w C3H8O + x O₂ → y CO₂ + z H₂O (c) w Fe + x H₂O → y Fe₂O3 + z H₂The formula of the hydrate of magnesium sulfate was determined (M9SO4.XH20) and the following data was obtained. Mass of crucible + lid + unknown 6.0236 g Mass of crucible + lid 4.0002 g Mass of unknown hydrate Mass of crucible + lid + residue: after 1 st heating 5.0842 g after 2 nd heating 5.0426g after 3 rdheating 5.0339g Mass of water lost Mass of anhydrous salt Percent Water in unknown hydrate Moles of water in hydrate sample Moles of anhydrous salt in hydrate sample Calculated Mole ratio(H2O: salt)_ Complete formula of the hydrateThe first two steps in the industrial synthesis of nitric acid produce nitrogen dioxide from ammonia: 4 NH3(g) +50₂ (g) = 4 NO(g) + 6H₂O(g) K₁ K2 2 NO(g) + O₂(g) 2 NO₂ (g) = The net reaction is: K 4 NH3(g) +70₂ (g) 4NO₂(g) + 6H₂O(g) Write an equation that gives the overall equilibrium constant K in terms of the equilibrium constants K, and K₂. If you need to include any physical constants, be sure you use their standard symbols, which you'll find in the ALEKS Calculator. K = 0 0.0 00 09 ? olo X G
