para cresol(p-cresol) known as bug killer and sanitizer. By combuston analysis of 0,3654 g sample of Carbon-hydrogen-oksigen, we obtain 1,0420g Co2 and 0.2437g H20. Molecular mass of the compound 216,2g. And so, (a) percent concentration by mass (b) easy formula (c) Molecular formula (C:12,01 g/mol H:1,008 g/mol 0:15,99 g/mol)
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- Write a balanced chemical equation for the reaction thatoccurs when (a) Mg(s) reacts with Cl2(g); (b) barium carbonatedecomposes into barium oxide and carbon dioxide gaswhen heated; (c) the hydrocarbon styrene, C8H8(l), is combustedin air; (d) dimethylether, CH3OCH3(g), is combustedin air.A hydrate [hydrates have the general formula AB • xH2O] is found to have the percentcomposition: Na = 19.17%, C = 10.00%, H = 4.17% and O = 66.6%. After heating to 100 oC todrive off the water of hydration, the percent composition is found to be: Na = 27.38%,C = 14.28%, H = 1.19% and O = 57.15%. From this data, determine the probable molecularformula for the hydrate if the molecular weight = 120 amu.An impure sample of table salt that weighed 0.8631 gg when dissolved in water and treated with excess AgNO3AgNO3 formed 2.040 gg of AgClAgCl . What percentage of NaClNaCl is in the impure sample?
- Consider Palmitic acid C16H32O2, a common fatty acid used in the manufacture of soap. A solution of palmitic acid is prepared by mixing 112 g palmitic acid with 725 mL of benzene C6H6. The density of the resulting solution is 0.902 g/mL. Palmitic acid (molar mass = 256 g/mol and density = 0.852 g/mL); Benzene (molar mass = 78 g/mol and density = 0.879 g/mL) A. What is the %m/m of the solution? B. What is the molarity of the solution? C. What is the mole fraction of the solvent?Consider Palmitic acid C16H32O2, a common fatty acid used in the manufacture of soap. A solution of palmitic acid is prepared by mixing 112 g palmitic acid with 725 mL of benzene C6H6. The density of the resulting solution is 0.902 g/mL. Palmitic acid (molar mass = 256 g/mol and density = 0.852 g/mL); Benzene (molar mass = 78 g/mol and density = 0.879 g/mL) 1. What is the % m/m of the solution? 2. What is the mole fraction of the solvent? 3. What is the molarity of the solution? Based from the calculated molarity of the solution in #3, you are to prepare 250 mL of the said molar concentration. If you have an available 2M stock solution of Palmitic acid, How many mL of the 2M palmitic acid stock solution will you need? and; 4. How many mL of solvent do you need to add to the amount gotten from the 2M Palmitic acid stock solution in order to prepare 250 mL total volume of your desired solution?2.513 grams of salicylic acid were allowed to react with excess acetic anhydride to give acetylsalicylic acid, or aspirin (along with acetic acid product). The aspirin was recrystallized from a chilled water/ethanol mixture to give 0.534 g of purified aspirin. What was the percent yield in this process? | |
- 0.004 C8H7NO3, 15mL ethanol, 0.002mol NaBH4 was used. HCl was used to acidify. It was then extracted with ether. Then it was dried and a mass of 0.32g was obtained. What is the balanced equation of this synthesis, and what is the limiting reagent?Aqueous solutions of ammonia (NH3) and bleach (activeingredient NaOCl) are sold as cleaning fluids, but bottlesof both of them warn: “Never mix ammonia and bleach, astoxic gases may be produced.” One of the toxic gases thatcan be produced is chloroamine, NH2Cl. (a) What is theoxidation number of chlorine in bleach? (b) What is theoxidation number of chlorine in chloramine? (c) Is Cl oxidized,reduced, or neither, upon the conversion of bleachto chloramine? (d) Another toxic gas that can be producedis nitrogen trichloride, NCl3. What is the oxidation numberof N in nitrogen trichloride? (e) Is N oxidized, reduced, or neither, upon the conversion of ammonia to nitrogentrichloride?Given that the Grignard reaction used 1.4555 g phenyl bromide, 10. g carbon dioxide, 0.5734 g magnesium filings, and 30.2 mL of 6M HCl , what was the limiting reagent in the overall reaction, assuming each stepwise reaction ran to completion with only the desired product forming?
- Ferrocene, Fe(C5H5)2(s), can be prepared by reacting 3.0 g of FeCl2(s) with anequal mass of cyclopentadiene, C5H6(l), and an excess of KOH, as shown in thefollowing reaction FeCl2 + 2C5H6 + 2KOH → FeC10H10 + 2H2Oa. What is the limiting reagent in this procedure?b. Based on your answer to part A, what mass of Fe(C5H5)2 couldtheoretically be formed?c. A student who carried out this reaction obtained 2.7 g of ferrocene. Whatwas the percent yield for this reaction?Aspirin (acetylsalicylic acid, C9H8O4) is made by reacting salicylic acid (C7H6O3) with acetic anhydride [(CH3CO)2O]: C7H6O3(s)+ (CH3CO)2O(l) → C9H8O4(s) + CH3COOH(l) In one preparation, 3.077 g of salicylic acid and 5.50 mL of acetic anhydride react to form 3.281 g of aspirin. (a) Which is the limiting reactant (d of acetic anhydride = 1.080 g/mL)? (b) What is the percent yield of this reaction? (c) What is the percent atom economy of this reaction?reactant amount : ~12 mL of a 0.320g/mL aqueous FeCl3s