Construct an enthalpy diagram with the following data to calculate the electron affinity of bromine. The standard heat of formation of NaBr is-360.0 kJ mol¹. The energy needed to vaporize one mole of Br₂00 to give Br₂(g) is 31 kJ mol2. Energy needed to vaporize one mole of Na(s) is 107.8 kJ. The first ionization energy of Na is 495.4 kJ mol. The bond energy of Brais 192 kJ per mole of Br-Br bonds. The lattice energy of NaBr is-743.3 kJ mol¹¹. The electron affinity is i kJ mol¹¹

The dictionary defines homogeneousas “uniform in compo-sition throughout.” River water is a mixture of dissolved com-pounds, such as calcium bicarbonate, and suspended soil particles. Is river water homogeneous? Explain

Sodium hydroxide solution was standardized against one gram of potassium phthalate. First trial used 52.0 ml of the solution while the second trial used 52.4 of the solution to reach the end point. (a) What is the standardized concentration of the solution? (b) If the task is to prepare a one tenth of a molar solution, what is the percent accuracy of the preparation? The standardized basic solution was then used in getting the total acidity of a food sample. Ten milliliter of the acidic sample consumed 10.3mL in the first trial then 10.0mL in the second trial to reach endpoint. (c) What is the normality of the acidic sample? Compute the total acidity of the food sample assuming that ten grams of sample was dissolved to 25ml of solution if the sample is: (d) Milk (MW, lactic acid =90) (e) Juice (MW, citric acid = 192.4; one mole citric acid reacts with three moles NaOH) (f) Vinegar (MW, acetic acid = 60) If you are a food safety inspector, would the sample pass if (include reason) (g)…

The following evidence was obtained from an experiment to determine the molar concentration of a sodium nitrate solution. A sample of sodium nitrate solution was evaporated to dryness and the mass of solid residue was measured.Evidence:Volume of solution = 10.00 mLMass of beaker = 79.54 gMass of beaker and residue = 82.96 gFrom this data, calculate the molar concentration of the original sodium nitrate solution. Record only your numerical answer with the correct number of significant digits.  You do not need to include units as the units appear for you beside the answer box already.

Foreattt part of iTIS qtestfoni; tonsider FOHOWIHg Btetat: You need to make a stock solution of Ca( C2H3O2 )2 with a concentration of 6.50 M. You have a 850.0 mL volumetric flask available to make this stock solution in. You are then tasked with using this stock solution to prepare a sample for use in an experiment. The experimental sample should have a final volume of 15.0 mL and a concentration of 0.350 M Ca(C2H3O2)2. a) What is the molar mass of Ca(C2H3O2)2? b) How many moles of the solute would be needed to create the stock solution using the volumetric flask available? c) How many grams of the solute should be added to the volumetric flask to create the stock solution? d) What volume, in mL, of the stock solution should be used to prepare the experimental solution through dilution? US 目 M

Twenty tablets (labelled 300 mg aspirin per tablet) had a total mass of 6.9117 g. The tablets were powdered and 0.5423 g of powder was added to 30.0 mL 0.494 M sodium hydroxide solution and the mixture boiled gently for 10 minutes. The excess alkali in the cooled solution was titrated with 0.475 M hydrochloric acid solution and 20.25 mL required for neutralization. Given that aspirin (C9H8O4) and NaOH react in a 1:2 ratio calculate the percentage of aspirin as compared to the labelled claim. Aspirin Mr(C9H8O4) = 180.2

Masses :  Ca = 40.08 g   S= 32.07 g  O= 16.00 g  A 35.0 mL sample of CaSO4 was evaporated to dryness, leaving 0.967 g of residue. What was the molarity of the original solution?   step by step please

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10. An element has two isotopes of relative atomic masses 41.0 u and 44.0 u. The relative abundance of the isotopes are 90.0% and 10.0% respectively. The average atomic mass of the element is: (A) 41.0u (B) 41.3u (C) 42.5u (D) 43.7u 2 11. Which of the following phrases best describes the term solubility? (A) the ability of a solvent to dissolve in a solute (B) the ability of a solute to dissolve in a solvent (C) the maximum amount of solute that will dissolve in solvent at a given temperature (D) the maximum amount of solvent that will dissolve in a solute at a given temperature 4

FAFSA® Applicatio. NG www.cfnc.org | 520.. NC Residency Deter. + Scholarships - Goo.. wh ccsf E Read [References] Use the References to access important values if needed for this question. In the laboratory, a student dilutes 26.6 mL of a 11.7 M nitric acid solution to a total volume of 200.0 mL. What is the concentration of the diluted solution? Concentration = M Submit Answer Try Another Version 1 item attempt remaining