0.7478g pure organic compound containing sulfur is dissolved with Na2O2 to convert it into Na2SO4. Then the sample is dissolved in water and the sulphate is dissolved as 1.089g BaSO4. Calculate the% sulfur in the sample? S = 32, O = 16, Ba = 137, Na = 23
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- 56g of the coal was kjeldahlized and NH3 gas evolved was absorbed in 50 ml of 0.1 N sulphuric acid. After absorption, the excess acid required 6.25 ml of 0.1 N NaOH for exact neutralization. 2.60g of the coal sample in a quantitative analysis gave 0.1755 g of BaSO4. Calculate the percentage of nitrogen and Sulphur in coal sample.What is the enthalpy change when 49.4 mL of 0.430 M sulfuric acid reacts with 23.3 mL of 0.309 M potassiumhydroxide?H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l) ΔH° = –111.6 kJ/molA sample known to consist of NaOH orNaHCO3, or Na2CO3 or possible compatible mixtures of these, together with inert matter. With methyl orange, a 1.10 g sample requires 31.40 mL of HCl (of which 1.00 mL ≈ 0.0140 g CaO). With phenolphthalein, the same weight of sample requires 13.30 mL of the acid. Calculate the percentage of inert matter in the sample.
- How much CaCO3 (in grams) would you need to produce theoretically 500 g of baghdadite, via solid-state sintering, assuming the CaCO3 is the sole source of Ca2+? (nearest whole number) *note that ths solid-state sintering method mix material in stoichiometric ratios. A. 365 gB. 146 gC. 150 gD. 122 gThe nitrogen content of organic compounds can be determined by the Dumas method.The compound in question is first passed over hot CuO(s): Compound + Hot CuO(s)------> N2(g) + CO2(g) + H2O(g) The gaseous products are then passed through a concentrated aqueous KOH solution to remove the CO2.The remaining gas contains N2 and water vapor.A 0.648-g sample of a compound was treated as above, producing 82.7 mL of N2 saturated with water vapor at 25 °C and 778.3 torr.What is the mass percent of nitrogen in the compound? (The vapor pressure of water at 25 °C is 23.8 torr.)Consider the series of reactions to synthesize the alum (KAl(SO4 )2 · xH2O(s)) from the introduction. (a) Assuming an excess of the other reagents, from one mole of aluminum Al (s), how many moles of alum will be produced? (b) Assuming an excess of the other reagents, from one mole of potassium hydroxide KOH, how many moles of alum will be produced? (c) Assuming an excess of the other reagents, from one mole of sulfuric acid H2SO4 , how many moles of alum will be produced? (d) If you start the synthesis with 1.00 g of Al, 40.0 mL of 1.50 M KOH, and 20.0 mL of 9.00 M H2SO4 , which of the three will be the limiting reagent? (e) Assuming that the product is anhydrous (that there are no waters of hydration), calculate the theoretical yield of alum, in grams, based on the amounts of reagents in part (d). 3. Consider the nickel salt: (NH4 )2Ni(SO4 )2 ·y H2O (Ammonium Nickel Sulfate Hydrate), where y is the number of coordinated waters. (a) Assuming that the product is anhydrous (y = 0),…
- CARBOXYLIC ACID SERIES Ethanoic Acid 3D Model of Its Molecular Structure Characteristics of the Compound Number of Moles in the Compound and Its Molar Mass Assuming that your compound has a mass of 10 grams. Show the complete computation. Percentage Composition of the Elements in the Compound. Show the complete computation.Please answer question 2: Instructions attached below .2. A 48.33-mL sample of 0.150 M NaBr is titrated into 50.00 mL of 0.145 M AgNO3. Bothsolutions had the same initial and final temperatures. The reaction occurred in a calorimeterwith a known heat capacity and produced 1546.03 J of heat.i. Write a balanced equation that is occurring.ii. Determine the theoretical yield of the solid.iii. Calculate the enthalpy of the reaction (kJ/mole of precipitate).Write and balance the reaction for the complete combustion of nonyne, C9H16.
- 1.What is the percentage composition of C6H12O6? Must show work. 2.Draw the Lewis structure for the following compounds (Be sure to show the process) CO2, Li2S, and H20. 3.Find the empirical of a compound with a percentage composition of 52.3% C, 13.0% H, 34.7% O. Must show work. 4.calculate the molar mass for Mg3(PO4)2, Ca(OH)2, and P2Cl5 (must show work) 5.what is the term for a digit in front of a chemical formula that helps to balance a chemical equation? 6.A bond that results from the electric attraction between cations and anions is called a(n): ? 7.which element is likely to form a covalent bond with chlorine? 8.Name the following compounds: AL(PO4), (NH4)2S, N2O3, SnCl4, CCl4. 9.write the formulas for the following compounds (please show work) Mercury (II) cyanide, Zinc hydroxide, aluminum dichromate, Copper (I) sulfide, Phosphorus heptabromide dichloride. 10.Determine if the following compound is polar, non polar, or ionic based strictly on electronegativity differences:…Hydrolysis of a compound B(formula C7H6Cl2) was carried out by refluxing with excess potassium hydroxide solution. The resulting solution was acidified with dilute nitric acid and excess silver nitrate added to precipitate the chloride ions as silver chloride,0.718g of silver chloride was formed from 0.805g of B. (a) Calculate the number of chlorine atoms present in each molecule of B which are liberated by hydrolysis. (b) Suggest an explanation for the result obtained in (a) (c)Give a possible structure for BCalculate the weight of lime (CaO) obtained by heating 2000kg of 95% pure lime stone (CaCO3).