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preparation of
a) 500 g of 4.75% (w/w) aqueous ethanol.
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- CH3 H CH3 CH;CHCH,CH2OH CH;COH CH;CHCH,CH,OCCH3 + H2O MW 88.15 g/mol density 0.809 g/mL MW 60.05 g/mol density 1.05 g/mL MW 130.19 g/mol density 0.876 g/mLDissolve 0.25g NaClI, 0.20g NaHCO3. 0.35g KCI, and 1.5g of glucose in 100 ml distilled water using a 250 mL capacity beaker. Use the formula to create a 60 mL ORS. Based on the given procedure, calculate the total amount of glucose in the prepared solution. (MW: Na: 23, K: 39, CI: 35, H: 1, C: 12, 0: 16) O 83.33 mmol/L 66.91 mmol/L 90.40 mmol/L 71.11 mmol/L O 23.81 mmol/L O 47.30 mmol/Lb) A carbonate of metal X has the formular X,CO3. The carbonate reacts with hydrochloric acid according to the following equation: X,CO3 + 2HC! → 0.25g of X,CO3 was found to neutralize exactly 23.6cm³ of hydrochloric acid of concentration 0.15moldm? ( RAM for C=12;0=16) i) Calculate the number of moles of hydrochloric acid 2XCl + CO2 +H,0 ii) Calculate the number of moles of X,CO3 iii) Calculate the relative molecular mass of X,CO3 iv) Calculate the relative atomic mass of X and hence deduce its identity c) Propanoic acid is a weak acid with an acid dissociation constant of 1.22x 10°moldm i) Write an equation for the ionization of propanoic acid -3 ii) Calculate the pKa for propanoic acid Lo iii) Sodium propanoate is made by the titration using 0.1M sodium hydroxide with propanoic acid A: Write an equation for the reaction B: Name a suitable indicator for this titration iv) A mixture of sodium propanoate and propanoic acid acts as a buffer solution. What is a buffer solution?
- (Q68) What mass (in grams) of ethylene glycol (C2H6O2) must be added to 1,296 grams of water to lower the freezing point to -1.10 °C? (3 sf)Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample. The stated should be 104.5, how??Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample.
- 2. Calculate the enthalpy of hydration of CuSO, if 16.34 g of CUSO, dissolves in water and gives out 55.51 kJ of heat (Q) and 25.17 g of CuSO4 • SH;O dissolves in water and absorbs 95.31 kJ of heat (Q). The molecular weight for CusO, is 160.00 g/mol, CusO, • SH;0 is 250.00 g/mol. Show ALL calculations-no calculations, no credit! CusO, (s) excess H,O Cu" (aq) so- (aq) AH1 + SH;0 АНа АНа excess H;0 CusO4 • SH20 (s)When a Vitamin C (ascorbic acid; MM = 176.12 g mol-1) tablet is crushed, dissolved and titrated with 0.0340 M KIO3(aq) to a purple/blue endpoint (given by a starch indicator), the volume of KIO3 used is 29.80 mL. If 60 mg of ascorbic acid is the recommended dietary allowance (i.e., 100% of the RDA), then what is the % RDA for the Vitamin C in the tablet? KIO3(aq) + 5 KI + 6 H+ → 3 I2(aq) + 3 H2O I2 (aq) + ascorbic acid → 2 I- + dehydroascorbic acid(a) 4.95 g of NaCl dissolved in 50.6 g of H2O % (b) 1.92 g of LiBr dissolved in 43.0 g of H2O % (c) 24.8 g of KNO3 dissolved in 351 g of H2O % (d) 3.9×10-3 g of NaOH dissolved in 3.3 g of H2O %
- Volume of acetic anhydride: 2.98 mL Mass of salicylic acid: 1.00 g Mass of aspirin recovered: 0.67 g Show that mmol of aspirin recovered divided by mmol of limiting reagent x 100% gives the same % yield (please explain) Thank you.The hydration of a hydrocarbon, but-2-ene, C4HS produces butan-2-ol, C4H10O as follows: Penghidratan terhadap satu hidrokarbon, but-2-ena, C4H8 menghasilkan butan-2-ol, C4H100 seperti berikut: C,Hg(g)+ H2O (g)→ C4H10O (g) The enthalpy values for the following reactions are: Nilai entalpi untuk tindak balas berikut ialah: 4C(s)+ 4H,(g)→C,H&(g) ДН %3-7.1 kJ 4C(s)+ 5H;(g)+ ;0,→C,H100(g) ДН 3D-292.8 kJ 2H,(g)+ O2(g)→2H,0(g) AH = -483.6 kJ %3D By using the data above, calculate the enthalpy change, AH (in kJ) for the production of butan-2-ol.How much Na2SO4 is required to precipitate 2.50 g of Ba(NO3)2 in the form of BaSO4? AW: Ba = 137.33, Na = 22.99, S= 32.07, N = 14.01, O = 16.00 O 2.50 g O 0.0176 mole O 0.0191 mole O 1.36 g